How to save in the cloud with tvOS?

We are developing an Apple Arcade title.
I have a question about data storage on tvOS.

iOS and Mac can use his GKSavedGame, but tvOS cannot.
https://developer.apple.com/documentation/gamekit/gksavedgame?language=objc

At tvOS, we are considering using iCloud Key Value Storage or CloudKit.
Are these available on Apple Arcade?

Also, could you please tell me if there is a standard way to do cloud saves on Apple Arcade?

How to save in the cloud with tvOS?
 
 
Q