Sensor for chair position

sensor.yaml

office_position:
    friendly_name: "Office position"
    value_template: >-
      {% if states.binary_sensor.chair.state == 'on' %}
        Standing up
      {% else %}
        Sitting down
      {% endif %}
    icon_template: >-
      {% if states.binary_sensor.chair.state == 'on' %}
        mdi:human-handsup
      {% else %}
        mdi:human-handsdown
      {% endif %}