X-posting from duplicate feature request: Doorbell sound via Google Home speakers
Google Assistant smart home notifications just became available and make this feature possible: Notifications for smart home Actions | Cloud-to-cloud | Google Home Developers
For the Opener it probably makes most sense to use the “ObjectDetection” trait for notifications such as “Someone is at the front door.”: Cloud-to-cloud | Google Home Developers
Making use of the new follow-up notifications for LockUnlock (“The front door has been locked” or “The front door is jammed”) and OpenClose (“The front door has opened” or “The front door couldn’t be opened”) would also be nice.