MQTT climate float on target temperature?

Configuration
1

This is my config for MQTT climate

climate:
  - platform: mqtt
    name: Riscaldamento
    modes:
      - Spento
      - Acceso
      - Automatico
    mode_command_topic: "HOME/CMD/HVAC/MODE"
    mode_state_topic: "HOME/STA/HVAC/MODE"
    mode_state_template: "{{ value_json.VALUE }}"
    temperature_command_topic: "HOME/CMD/OUT/TEMP"
    current_temperature_topic: "HOME/ENV/TEMP"
    payoad_on: "1"
    payload_off: "0"
    initial: 19

In the web page I’m unable to set a floating value for the target temperature… it’s possible to define a step for the target tempearture of 0.5 degree instead of 1 degree?

https://screenshots.firefox.com/AC50QalN18IlggZj/192.168.1.80