Override environment variable when using a list

[bentonjimmy]

I'm trying to create an override environment variable so that I can use an environment variable to set the resource namespace of a metric. Below is the snippet of yaml that I'm attempting to override. I'd like to replace the namespace value of value-to-be-overrided with the value from an environment variable. I tried name: PROMITOR_YAML_OVERRIDE_metrics__0__resources__0__namespace which didn't override the value.

metrics:
  - name: ogma_deadlettered_queue_size
    description: "Amount of deadlettered messages of the 'ogma' queue"
    resourceType: ServiceBusNamespace
    azureMetricConfiguration:
      metricName: DeadletteredMessages
      aggregation:
        type: Total
    resources:
      - namespace: value-to-be-overrided
        queueName: ogma

Is it possible to use the environment variables this way? What is doing the overriding of the yaml values?