Open iCloud settings from my app URI / URL Schemes

I went through some old posts and seems this is not possible but I would like to know if there's any update:

Is it not possible to open iCloud settings from the app?
I tried with the following URI Schemes:

prefs:root=CASTLE (doesn't work)
App-Prefs:root=CASTLE (brings me to the default settings window)

Considering the iCloud settings need to be enabled to use CloudKit or GameKit and some users don't even know where are the iCloud settings I think this is quite important.