Just want to say that this is something I have been waiting for since Extensions came out! In fact honestly I was a bit surprised that this wasn’t a thing when Extensions first launched as it made complete sense to me that this would be how it all worked.
Glad to see this is coming and if there is a beta I would love to volunteer to be a part of it - I have 3 or 4 live and actively used Extensions which could be improved by this service.