This is really interesting to me. At my job I maintain a very similar iOS render. Our app is built on the exact same principles, we have 3 native renderers (iOS, web app and Android) that consume the same JSON and generate native UI at runtime.

The schema even looks similar and as far as I know no one was aware of this project when this was built.

There are major disadvantages to this approach of course but there are also many many advantages.