Yes there is a way to install the Google nest cameras with Batterie in homey. Of course you have first to install it in Google home, with your smartphone. That is only possible with the Android Google home app!
Then you need to install the app Google nest in homey.
After that you have to share all cameras with homey. therefore you go to the Google home app. Go to setup (icon with gear symbol on the right bottom corner). Then go under “Dienste” (that’s the German word) and search for “Verbindung mit Drittanbietern”. Than you chose your homey and there you can share all cameras and there different functions.
After that you have your cameras in homey integrated.
But unfortunately the report of movement, person detection a.s.o. doesn’t work properly. Only one doorbell functions without problems. All others don’t report to homey and I don’t know why not.