Google has released a new Public Preview update for the Google Home app. The update allows smartwatches running Wear OS 3 to display notifications with preview images from Nest cameras and video doorbells, among other changes.https://www.notebookcheck.net/Google-Pixel-Watch-and-Samsung-Galaxy-Watch5-series-receive-improved-smart-camera-and-video-doorbell-support.709347.0.html
Galaxy Watch 4 series also runs WearOS 3 and should be compatible with the new update.