This post from DAZN Engineering contains various stories that could be cross-referenced with existing patterns:
https://medium.com/dazn-tech/building-a-dx-team-lessons-learned-4a66446088bc

There are other posts from DAZN as well that may be related e.g.
https://medium.com/dazn-tech/developer-experience-dx-at-dazn-e6de9a0208d2
https://medium.com/@nodefortytwo/what-is-platform-engineering-a6e8bff1d9c6
https://medium.com/dazn-tech/integrating-backstage-at-dazn-b8ef5268b347

Who knows, maybe even some new patterns could be extracted?

What I spotted in the article:

• DAZN InnerSource Marketplace => InnerSource Portal, maybe also Gig Marketplace (also an example of using Backstage for these)
• RFC process => Transparent Cross-Team Decision Making using RFCs
• likely more ...