Specifying a $ref in the info.description section

[micheledicosmo]

I need to specify an external reference ($ref) in the info.description section to refer to an external documentation file.

The use case is for integrating with documentation generators which read those references, however info.description cannot be an object and has to be a string according to the current version.

For example:
https://docs.bump.sh/help/enhance-documentation-content/markdown-support/

is expecting this:

openapi: 3.1.0
info:
  title: Bump API documentation
  version: 1.0.0
  description:
    $ref: "./docs/introduction.md"
servers:
  ...
paths:
  ...