Send to knx bus a variable on payload

Please i need to send a variable to a group adress on the knx bus instead of “25”:

service: knx.send
  response: false
  address: 5/6/3
  payload: 25            <---- input_number.temperature_ideale
  type: temperature

Thank you for your help.

Hi :wave:!
Use a template {{ states("sensor.entity_id") }}
Or knx expose