Thermostat card missing power on/off

Hello,
I have configured an air conditioning unit via the knx climate entity. The device is controlled via the thermostat card. This works. However, the air conditioner cannot be switched on via the operating mode. I therefore need an additional switch which switches the air conditioner on.
Is it possible to add this button to the thermostat card?

yaml config of the climate knxs device:

climate:
    - name: "Klima Schlafen"
      on_off_address: "4/2/87"
      on_off_state_address: "4/2/88"
      controller_mode_address: "4/2/89"
      controller_mode_state_address: "4/2/90"
      target_temperature_address: "4/2/91"
      target_temperature_state_address: "4/2/92"
      temperature_address: "4/2/93"