Extension tags exclusively for Web Capture?

Would it be possible to allow setting extension tags exclusively for Web Capture? Like there is an extension template only for Web Capture?

For example, I use a self-explanatory tag named “excerpt”. When capturing from the web this is definitely an excerpt, hence I’d like to see the captured text tagged “excerpt” automatically.

On the other hand I use sharing from other apps to Drafts also for my own stuff, hence no tag “excerpt”.

So it would come very handy if there was a way to handle tags for Web Capure and non-Web Capture separately.

What would come even more handy would be passing the information to Drafts (as a tag or otherwise) from which app the content was shared. But I don’t now if macOS even allows that.