So... you already owned Google Home minis... why not buy Google's Nest doorbell, which rings every Google Home device out of the box with none of the absurdity? If you have a Google 4k TV Streamer, it even pops up on your TV when someone rings the doorbell...

Indeed the Nest integration is pretty solid.

That said, the author might also consider installing an actual doorbell, which is a device their home should have had decades ago. You'll also want something to provide power to the Nest, so this is almost free.