That's the reason I posted this, since this is kind of using, without the drawbacks (of not having comments etc)

I wonder if folks had had experience using it for kubernetes configs like https://jsonnet.org/articles/kubernetes.html

Pretty sure stripe built skycfg for this very purpose, but it uses starlark for the language, which is quite a lot nicer IMHO.

I was not convinced by that article but it raised my awareness to the point I was happy to click on this one.

Presumably, the author of that would be happy with Jsonnet, which isn't JSON.