In T8066#161913, @smithjd wrote:

A slightly smarter approach would be for Plasma Vaults itself to add such a rule for whatever mountpoint is chosen during new vault creation.

What about exposing these config options on dbus? ("includeFolders"),("excludeFolders")

That would make for 4 new entries (add/remove for each) on the org.kde.baloo.main interface.

I'm not technically knowledgeable to offer an opinion on that, so I will defer to @bruns.