Last time I've checked, kdeconnect-ios was unable to read any third-party notifications, not to mention doing anything to them or modifying their text or appearance in any way.

Project readme still says "Notification syncing doesn't work because iOS applications can't access notifications of other apps" (https://github.com/KDE/kdeconnect-ios?tab=readme-ov-file#kno...) so I think it's still a thing.