I'd love to learn about compilers by working on an actual real world compiler, but I really only know high level details about how different components fit together. I also don't have a formal CS education, although I am currently working as a senior level data engineer. Not sure if that is the sort of person they are looking to mentor.
Just find one that you'd like to work on, write that you are going to work on it, and start doing the work, and asking lots of questions.
Sure, there are probably some projects for which if the primary author leaves, their coworkers will drop it or rewrite it in another language, but for others the management will realize what a liability it was to have all of their eggs in that one basket and they’ll have to hire 2 to replace them.
If you steal 25 to work on the kernel, you will likely see 25 open reqs to replace them. And more people will work with languages that they have seen reqs for.
Second, the compiler team has put a ton of effort into mentorship infrastructure, and you can go from not knowing a ton to being a productive member of the team with their help. It "just" takes time and desire to do it.