Victron - value of three single sensors in one sensor?

Hej,

I did integrate my Victron Solarsystem to HA via MQTT. All works fine and I also create working sensors.
My problem is, that there is no value for the total consumption but seperate for L1 L2 and L3. How can I add them up to a single sensor?
what I have is this:

  # AC Verbrauch L1
  - name: "Victron AC Gesamt L1"
    device_class: power
    unique_id: "ac_consumption_L1"
    state_topic: "venus-home/N/c0619ab2dec6/system/0/Ac/Consumption/L1"
    value_template: '{{ value_json.value[0].Power|float(0)|round(0) }}'
    unit_of_measurement: "W"
    icon: mdi:power-socket-eu
    
  # AC Verbrauch L2
  - name: "Victron AC Gesamt L2"
    device_class: power
    unique_id: "ac_consumption_L2"
    state_topic: "venus-home/N/c0619ab2dec6/system/0/Ac/Consumption/L2"
    value_template: '{{ value_json.value[0].Power|float(0)|round(0) }}'
    unit_of_measurement: "W"
    icon: mdi:power-socket-eu
    
  # AC Verbrauch L3
  - name: "Victron AC Gesamt L3"
    device_class: power
    unique_id: "ac_consumption_L3"
    state_topic: "venus-home/N/c0619ab2dec6/system/0/Ac/Consumption/L3"
    value_template: '{{ value_json.value[0].Power|float(0)|round(0) }}'
    unit_of_measurement: "W"
    icon: mdi:power-socket-eu