[Bitbucket Pipelines] Sharing pipeline yaml across multiple repos

Problem:

I have 20 Frontend repos that all use the same Bitbucket pipelines file. It's a pain to upgrade these files manually and I would like to have one place to update it/version it and use across all these 20 repos.

Current solutions:

Bitbucket pipelines does not allow reusing yaml across repos. It only allows custom docker containers with pipe and reuse of steps in same file with Anchors. 

Suggestion:

Allow a user to reference another repo/pipeline and pass options or variables to such. This will allow reusing the same pipeline file without having to maintain 20 files. It will also allow these pipelines to be efficient - use parallel jobs etc.