I had this exact problem a while ago when trying to have static types for blog entries. I ended up using a strategy where I would write the config in the langua

I had this exact problem a while ago when trying to have static types for blog entries. I ended up using a strategy where I would write the config in the language that I would eventually use it in (for my blog, my entries became typescript files). I think perhaps protobufs (specifically text format protos) are a potentially really nice solution, since you get to leverage the protobuf type system. Unfortunately the support for them is a bit lacking.... (afaik, no formal spec - there’s a canonical implementation in C++; no editor support for things like linting and completions).