Shelly 2 as roller shutter with percentage

Configuration
62

Finally i was able to made shelly works fine in roller mode with position in percent.

But i can’t find a way to get roller power consumption .

This is my code after searching in shelly’s API docs:

cover:
  - platform: mqtt
    name: persiana_estudio
    command_topic: "shellies/shellyswitch-XXXXXX/roller/0/command"
    position_topic: "shellies/shellyswitch-XXXXXX/roller/0/pos"
    set_position_topic: "shellies/shellyswitch-XXXXXX/roller/0/command/pos"
    availability_topic: "shellies/shellyswitch-XXXXXX/online"
    payload_available: "true"
    payload_not_available: "false"
    payload_open: "open"
    payload_close: "close"
    payload_stop: "stop"
    retain: false
    optimistic: false
    qos: 1
    position_open: 100
    position_closed: 0
sensor:
  - platform: mqtt
    name: "Potencia"
    state_topic: "shellies/shellyswitch-XXXX/roller/power"
    unit_of_measurement: "W"

Has anybody a clue of what i’m doing wrong?