diff --git a/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/ContainsSQLFunction.java b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/ContainsSQLFunction.java
new file mode 100644
index 0000000000..63d37cd4e0
--- /dev/null
+++ b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/ContainsSQLFunction.java
@@ -0,0 +1,52 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.kie.kogito.index.postgresql;
+
+import java.util.List;
+
+import org.hibernate.dialect.function.StandardSQLFunction;
+import org.hibernate.query.ReturnableType;
+import org.hibernate.sql.ast.SqlAstTranslator;
+import org.hibernate.sql.ast.spi.SqlAppender;
+import org.hibernate.sql.ast.tree.SqlAstNode;
+import org.hibernate.type.BasicTypeReference;
+import org.hibernate.type.SqlTypes;
+
+public class ContainsSQLFunction extends StandardSQLFunction {
+
+    static final String NAME = "contains";
+
+    private static final BasicTypeReference<Boolean> RETURN_TYPE = new BasicTypeReference<>("boolean", Boolean.class, SqlTypes.BOOLEAN);
+
+    public ContainsSQLFunction() {
+        super(NAME, RETURN_TYPE);
+    }
+
+    @Override
+    public void render(
+            SqlAppender sqlAppender,
+            List<? extends SqlAstNode> args,
+            ReturnableType<?> returnType,
+            SqlAstTranslator<?> translator) {
+        args.get(0).accept(translator);
+        sqlAppender.append(" ?? ");
+        args.get(1).accept(translator);
+    }
+
+}
diff --git a/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/CustomFunctionsContributor.java b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/CustomFunctionsContributor.java
new file mode 100644
index 0000000000..b233f8c752
--- /dev/null
+++ b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/CustomFunctionsContributor.java
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.kie.kogito.index.postgresql;
+
+import org.hibernate.boot.model.FunctionContributions;
+import org.hibernate.boot.model.FunctionContributor;
+
+public class CustomFunctionsContributor implements FunctionContributor {
+
+    @Override
+    public void contributeFunctions(FunctionContributions functionContributions) {
+        functionContributions.getFunctionRegistry()
+                .register(ContainsSQLFunction.NAME, new ContainsSQLFunction());
+    }
+}
\ No newline at end of file
diff --git a/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/PostgresqlJsonHelper.java b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/PostgresqlJsonHelper.java
index 6ca18f3567..4ea3fabfe9 100644
--- a/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/PostgresqlJsonHelper.java
+++ b/data-index/data-index-storage/data-index-storage-postgresql/src/main/java/org/kie/kogito/index/postgresql/PostgresqlJsonHelper.java
@@ -72,6 +72,9 @@ public static Predicate buildPredicate(AttributeFilter<?> filter, Root<?> root,
                 values = (List<Object>) filter.getValue();
                 isString = values.get(0) instanceof String;
                 return buildPathExpression(builder, root, filter.getAttribute(), isString).in(values.stream().map(o -> buildObjectExpression(builder, o, isString)).collect(Collectors.toList()));
+            case CONTAINS:
+                return builder.isTrue(
+                        builder.function("contains", Boolean.class, buildPathExpression(builder, root, filter.getAttribute(), false), builder.literal(filter.getValue())));
         }
         throw new UnsupportedOperationException("Filter " + filter + " is not supported");
     }
diff --git a/data-index/data-index-storage/data-index-storage-postgresql/src/main/resources/META-INF/services/org.hibernate.boot.model.FunctionContributor b/data-index/data-index-storage/data-index-storage-postgresql/src/main/resources/META-INF/services/org.hibernate.boot.model.FunctionContributor
new file mode 100644
index 0000000000..16518ef1b2
--- /dev/null
+++ b/data-index/data-index-storage/data-index-storage-postgresql/src/main/resources/META-INF/services/org.hibernate.boot.model.FunctionContributor
@@ -0,0 +1 @@
+org.kie.kogito.index.postgresql.CustomFunctionsContributor
\ No newline at end of file
diff --git a/data-index/data-index-storage/data-index-storage-postgresql/src/test/java/org/kie/kogito/index/postgresql/query/ProcessInstanceEntityQueryIT.java b/data-index/data-index-storage/data-index-storage-postgresql/src/test/java/org/kie/kogito/index/postgresql/query/ProcessInstanceEntityQueryIT.java
index 872ba48906..a929f2b689 100644
--- a/data-index/data-index-storage/data-index-storage-postgresql/src/test/java/org/kie/kogito/index/postgresql/query/ProcessInstanceEntityQueryIT.java
+++ b/data-index/data-index-storage/data-index-storage-postgresql/src/test/java/org/kie/kogito/index/postgresql/query/ProcessInstanceEntityQueryIT.java
@@ -111,10 +111,9 @@ void testProcessInstanceVariables() {
                 processInstanceId);
         queryAndAssert(assertWithId(), storage, singletonList(or(List.of(jsonFilter(notNull("variables.traveller.aliases")), jsonFilter(lessThan("variables.traveller.age", 22))))), null, null, null,
                 processInstanceId);
-        // TODO add support for json contains (requires writing dialect extension on hibernate)
-        //queryAndAssert(assertWithId(), storage, singletonList(jsonFilter(contains("variables.traveller.aliases", "TheRealThing"))), null, null, null,
-        //       processInstanceId);
-        //queryAndAssert(assertEmpty(), storage, singletonList(jsonFilter(contains("variables.traveller.aliases", "TheDummyThing"))), null, null, null,
-        //        processInstanceId);
+        queryAndAssert(assertWithId(), storage, singletonList(jsonFilter(contains("variables.traveller.aliases", "TheRealThing"))), null, null, null,
+                processInstanceId);
+        queryAndAssert(assertNotId(), storage, singletonList(jsonFilter(contains("variables.traveller.aliases", "TheDummyThing"))), null, null, null,
+                processInstanceId);
     }
 }