Hello, I will join this year and happy to participate.
I could do a brief update on the State of Jenkinsfile Runner as a part of project updates (we still consider it a sub-project, right?), and happy to join any developer tooling discussions.
P.S: Ofc happy to talk Gradle too, e.g. creating a Conventional plugin that would be equivalent to Plugin POM. I was thinking about it as a potential GSoC project idea