One you have Google Assistant Relay setup, you use Rule Machine and the TTS capabilities, choosing Google Assistant as the speech device. Adding [CC] at the front of the "Custom message to send" value, such as [CC] Turn on the dining room lamp. That command for google assistant could be linked to a lamp that is attached to an unsupported device by Hubitat, but one that is supported by Google Assistant. So instead of speaking “Turn on the dining room lamp”, Google Assistant will not speak the phrase, but will instead do that command.
If you want a verbal reply to your silent command, you instead prefix the command with [CCC].
