Jsonschema is still json and yaml is absolutely not comfortable to work with. It’s only enough for simple configs. As soon as you have the urge to use a template you should replace it with something else.
I use jsonnet for templating and transformation and jsonschema for validation. Very happy with this combination. One big reason is that there are lot of libraries and codegen tools to choose from once you have the JSON generation pipeline (including schema generation) down.
