Climate: why not make an independent power button?

For some air conditioners, power and mode are independent, people can control the power without changing the mode.
But Home Assistant climate mix the power state with mode “off”, I cannot add an independent power button, can we do some optimization?

I tried to add “power_command_topic” and “power_state_topic”, but it didn’t work.

The climate platform provides the climate.turn_off and climate.turn_on services, however not all integrations support it.

Which integration are you using?

I’m using climate with MQTT, configured with yaml.
I saw the climate.turn_off and climate.turn_on services in the developer tool, but no power buttons in the default thermostat lovelace.