Besides this project I like sqlc a lot but in both scenarios I was wondering how one gets started in code generation tooling? So that I could contribute, extend or even create my own (I.e. I would like to extend sqlc for better integration with FastAPI).
Then I would try to do something small to experience both libraries hands-on as otherwise it's hard to get the hang of it. Once you did a small project I would go and try to contribute a small fix/feat to sqlc to understand sqlc code structure and from there potentially a bigger feature/extension for sqlc.