What is the ultimate end goal?

Template apps are on the Template Plan

and as such any paid plugins can be installed on the template app for free, and once a user downloads the template, the plugin is automatically installed, although in the event it is a paid plugin, the user will then need to pay or subscribe. But, even before doing so, the plugin is still in the app and all actions and features of the app that use the plugin are still setup properly.

In terms of the use of the import app feature, I doubt that is the approach you’d want to take as when adding in new features, your JSON file for the app changes, and I’m not sure that importing the new JSON file is going to overwrite the existing file or be seen as modifying it.

Just keep in mind the Parent App is the Template which is on a Template Plan and the sub apps that you create from the Template can be on Paid Plans, but the Template app itself is not.

If the app is on a template pan it can not import/export…seems like must be on growth plan for that

Are you basically wanting to offer a template that is a component library?