Identify if voice command (google home) was used and use different automation

Hi all,

Soon I will have an electric heater in my bathroom which I plan to switch using a kaku acm-2000 switch. It will be controlled by my rfxcom. Temperature is monitored by an aquara zigbee temperature/humidity sensor.
For maximum WAF I decided to:
a) have it on a program (thermostat card in HA) with a schedule. This ensures the bathroom will be heated to let’s say 20 degrees on certain times. The thermostat card ensures the possibility for manual override to higher or lower temperature using the HA app
b) expose the heater kaku switch to google home and have it voice operated. “Hey google heater on” WITHOUT temperature mentioned

Now, I wonder if it is possible for HA to know if a voice command was given so I can call a certain automation to have the heater do it’s thing the way I want. Let’s say heat to 19 degrees by default and pause 5 minutes when the temperature was reached before powering on again.

Or do we have other options?