You can not use one Angular app inside other without side effects and tuning. So Angular app in general can not be a control (like input or select) for another app.

$.my apps behave like complex controls – you can enclose one $.my app into other, you even can make this enclosure recursive (for example http://cloudwall.me/etc/json-editor.html).

Also since $.my manifests are JSON docs, you can combine them just attaching one manifest as a property of another manifest – so app of nearly any complexity can exist as a single JSON.

This seems like it would be more lightweight flexible than something like angular. With angular you have to do everything with data attributes (which is fine for a lot of use cases) but this can be done in all js with "normal" HTML.