Creating timers not supported with Google SDK?

Third party integrations
1

Newbie to Home Assistant here.

I’ve completed the Google SDK integration and I can do things like:

action: google_assistant_sdk.send_text_command
data:
  command: Tell me a joke
  media_player: media_player.kitchen_speaker

Which my kitchen device thusly tells a joke.

But what I wanted was to send it a command to set a timer (below), but instead it just says “sorry, I can’t manage timers on this device” (to be clear: if I invoke the device and say the command it works fine):

action: google_assistant_sdk.send_text_command
data:
  command: Set a 12 minute timer
  media_player: media_player.kitchen_speaker

Any advice on what I might be doing wrong?