How to use CloudKit CKDatabase saveSubscription method on Fuse in Uno

Hi All

These days I was working on a Fuse app powered by CloudKit

CKDatabase publicDatabase = [[CKContainer defaultContainer] publicCloudDatabase];
    [publicDatabase saveSubscription:subscription
                    completionHandler:^(CKSubscription subscription, NSError *error) {
                        if (error)
                            // insert error handling

but can not find how to use saveSubscription method on Uno,

always saying iOS.CloudKit.CKDatabase dosent have menmber called saveSubscription or saveSubscriptionCompletionHandler

Where is the documentation to CKDataBase saveSubscription?

Are you use the iOS bindings for this?