Mqtt light

Configuration
1

I want to set one mqtt dimmer that must get {“turn”:“on”, “brightness”:50}

I have set it like this

  - platform: mqtt
    name: "Light 1"
    command_topic: "shellies/xxxx"
    state_topic: "shellies/xxxx"
    state_value_template: "{{ value_json.ison }}"
    brightness_command_topic: "shellies/xxxx"
    brightness_state_topic: "shellies/xxxx"
    brightness_scale: 100
    on_command_type: "brightness"
    brightness_value_template: '"turn":"on", "brightness":{{brightness}}'

But i still get over mqqt only 50 without any other message

2

This doesn’t look right to me as a template.