EDIT: this doesn’t solve the tags things if you want to continue using apps using the main UI, but if someone comes across this post for flexibility, I’ll leave my original reply
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ORIGINAL REPLY: Actually I just stumbled across a genius idea from another user.
You know when you create an app in EE you can create a custom app and paste a custom config. Then this user pastes an include to another compose file.
Here’s the full example: Electric Eel - How I am using Dockerfile, .env files, compose files
Hope this helps by providing another way of creating boxes