I don't think this is possible - "WatchKit provides one-way communication between the interface objects in your extension and the corresponding interface elements in your watchOS app. You can set the values of an interface object, but you cannot get the current values. If you want to know the current value of an attribute, you must save the value yourself." (https://developer.apple.com/documentation/watchkit/wkinterfaceobject)
– AleksanderApr 04 '19 at 14:16
Moreover, even if you'll get to know about the values, there's no way you can set the values. Curious, why you want to get that?
– HemangMay 07 '19 at 06:18