[Feature request] Allow/enable "Add link" functionality in "Open by default" (App info)

[novoid]

Checklist

• I have searched for existing issues (open and closed) and confirmed this feature hasn't been requested before
• I believe this feature request will benefit more than 10% of users, not just myself

Feature Description

What I saw on my GrapheneOS (most current) with PipePipe 5.2.4:

1. long press app icon -> "App info"
2. "Open by default" (list of URLs which PipePipe feels responsible for)
3. Scroll to the end and see "Add link" disabled

What I would expect:

See "Add link" enabled so that I may add, e.g., PeerTube instances I would like to use with PipePipe.

Reason:

PipePipe can handle PeerTube video URLs as the default URL list entries suggest (I do see multiple tube.* and peertube.* domains in the list).

PipePipe can't never have a full list of all PeerTube instances in the world. (My two favorite instances are not listed.)

Therefore, I would like to be able to add my favorite PeerTube instances to the list so that PipePipe opens, when I click a PeerTube-URL, e.g., in my Mastodon client app. If possible, I should be to add tube.* and peertube.* (with wildcards) to the list, assuming that domain names like that do provide PeerTube instances and PipePipe may handle them properly. If not, I'd expect a warning and I can deal with that accordingly.

Thanks for listening. 🙇

Related: #1639 -> already closed but this feature request would solve similar issues for the future as well