Wiser works with Google Home, so yes you can use Google Home to control it. I have one problem with Wiser, and not really a Wiser fault as such, my wife's bedroom radiator is on an outside north wall, current 16.5°C, where living room current 20.5°C sunny day today, and the centre of the bedroom is well above 16.5°C. Really, it needs a wall thermostat on an internal wall. This may be possible, but not really tried to link a wall thermostat to the TRV.
The app does not really help.

It allows one to adjust the temperature, but not really set any schedule, but the Google Nest speakers allow one to do a lot more, as to how much I am not sure, never really tried, the app tells me when we arrived home, but it gets it wrong, as it works this out from when we walked past the Nest Gen 3 thermostat which I also use.
What I realised is heating is slow to react, turning it on at 5 pm, and the room will not be warm for at least an hour, so the whole idea of geo-fencing is flawed, as it turns back on too late.
However, I know the geo-fencing uses IFTTT, and I have used IFTTT to get extra time slots with Energenie stuff, so maybe it can be done?
It would seem you need to create a moment, have you tried doing that?