Have favourite locations encrypted and be shared by apps using permissions
Favourite locations are a great thing to be shared by different apps, eg itinerary, ktrip, marble, but maybe also something in the domain of home automatisation.
So it would be great if all apps could profit from one common storage of locations (maybe nextcloud makes sense here).
As favourite locations are very sensitive information there should be something to make sure they cannot be accessed directly. I don't know if encryption is the only way how to achieve this.
The user can then explicitly allow Apps to connect to the favourite location storage, maybe even on location group basis.