On a rooted/jailbroken phone, there are apps that just dump the database into a readable format.
Theoretically you might be able to get something out of the local or cloud backups, but they're encrypted so they're probably difficult to get a hold of. The key is stored in the private application data, but there must be some way to get it back/regenerate it because you can restore a backup without copying any secrets from the previous phone.
