Controll TRV with Google Home

Is there a way to control my Devolo TRV’s with Google Home?
When I ask my Nest Mini to set the temperature to 21°C it says, that my thermostat can’t do that. So as of now, I have a Scene that switches the thermostat to 21°C and another scene that switches it to 17°C, but I would like to not rely on scenes and instead tell my Nest Mini whatever temperature I want.

If you need more informations just ask and I hope I can deliver.

Thanks in advance!