We support anchors in our CI/CD syntax at RWX, but only in a specific `aliases` section. I think this is a nice compromise.

  aliases:
    common-env: &common-env
      key1: value1
      key2: value2

  tasks:
    - key: some-task
      run: ...
      env:
        <<: *common-env

https://www.rwx.com/docs/mint/aliases