How to mirror VoIP notification on WatchOS 9 and iOS app?

We're currently trying to develop an Apple Watch companion app for our iOS app using the new WatchOS 9 which has the VoIP call capabilities. Is there a way to mirror VoIP notifications similarly to push notifications between the WatchOS app and iOS app? Essentially we'd like to be able to send a VoIP notification to the iOS app and have the answer/decline call screen show up in both the iPhone and Apple Watch. Currently when we send a VoIP notification to the iOS app, the Apple Watch does not receive anything. Push notifications and local notifications work just fine.