Is there a way to skip a pipeline when there are markdown changes only?

Goal

The release pipeline should start a deployment for specific branches.
This should not happen (skip the job), if there are only documentation changes. (*.md files)

The problem

If you change multiple files, but only one file ends in .md, the build job is still skipped. The job does not run for any of the files.

https://docs.gitlab.com/ee/ci/jobs/job_control.html#onlychanges--exceptchanges-examples

So, is it even possible to specifcy a rule as mentioned above?

What I tried so far (an excerpt)

So, if "*.md" doesn't work, is it possible to revert it?
"**/!(*.md)" # Every file except *.md

This does not execute anything

  rules:
    - if: $CI_COMMIT_BRANCH == "main"
      changes:
      - "**/!(*.md)" # Every file except *.md

This executes always

  rules:
    - if: $CI_COMMIT_BRANCH == "main"
    - changes:
      - "**/!(*.md)"

Question

Do I have to use custom variables to solve this problem or is there a simpler way?

After contacting the GitLab Support, I can document here, that there is no way of doing that currently.

A new issue has been created for this specific use case:
https://gitlab.com/gitlab-org/gitlab/-/issues/348141