How to apply ringtone from iphone 12 pro to a iwatch 9
How to apply the same ringtone purchased from a iPhone 12pro
to an iwatch series 9?
Apple Watch Series 9, watchOS 11
You can only use the default ringtones that you see in Settings/Sound & Haptics/Ringtones/ on your watch.
But, if you use the Feedback link, you can tell Apple directly about your wishes for future watchOS updates.
This is the only way to reach them, as Apple does not follow theses user to user communities.
Feedback - Apple Watch - Apple