Controlling voice notifications / visitor announcements from Nest doorbell in Google Assistant

I’m new to Home Assistant, so I’m just setting everything up and testing.

I have a Google Nest Doorbell (NC5100GB) and 8 Google Minis + 1 Google Display. There’s a setting in the Nest doorbell to toggle “Voice Notifications” on/off. I*'m trying to set up an automation so that when everyone leave the house this is switched off, and then when one person comes home this is switched back on. (We have a nervous dog who freaks out at the doorbell going off when we’re not in)

I can’t see this setting exposed in the doorbell or in Google Assistant. I’ve tried and failed to find a text command to send to Google Assistant.

Am I missing anything or is this just not possible?