Very cool, I've done similar in the past. One point of contention is that I like YAML more than JSON for this kind of effort as multi-line text is much easier

Very cool, I've done similar in the past. One point of contention is that I like YAML more than JSON for this kind of effort as multi-line text is much easier to deal with. I'd also generate typescript definitions based on the YAML/JSON for the default built values that has tended to help with the dev side (at least for JS/web projects).