Fully Kiosk Browser

EDIT: Cancel that. The below does not work as the JSON does not update for some reason.

I found a workaround here. Thanks @atomicpapa

mqtt:
  sensor:
    - name: FKB Tablet JSON 
      unique_id: fkb_tablet_json
      state_topic: "fully/deviceInfo/galaxytab10"
      json_attributes_topic: "fully/deviceInfo/galaxytab10"

Then strip the attributes from the new sensor.

sensor:
  - platform: template
    sensors:
      tablet_charging_status:
        friendly_name: Tablet Charging Status
        value_template: >-
          {% if is_state_attr('sensor.fkb_tablet_json', 'isPlugged', true) %} Yes {% else %} No {% endif %}
        icon_template: >-
          {% if is_state_attr('sensor.fkb_tablet_json', 'isPlugged', true) %} mdi:power-plug {% else %} mdi:power-plug-off {% endif %} 

There may be a way to use json_attributes_template: to strip the actual charging state directly but I can’t figure that out.