I had a similar idea and started with an android app [1] for creating an app template with a simple interface directly on the device. It's not as powerful as this, but maybe I can implement basic support for these templates. But right now this would be only like a viewer and not something that can be used for own apps, not sure how useful that could be.

[1] https://play.google.com/store/apps/details?id=com.bashtian.a...

There is something called json2view[0] for android which allows you to render the views according the specific json format. Definitely not as powerful as Jasonette but could be useful sometimes.