gistfile1.txt

  - platform: template
    fans:
      bedroom_fan:
        friendly_name: "Bedroom fan"
        value_template: "{{ states('switch.shelly_shsw_pm_006037') }}"
        turn_on:
          service: switch.turn_on
          entity_id: switch.shelly_shsw_pm_006037
        turn_off:
          service: switch.turn_off
          entity_id: switch.shelly_shsw_pm_006037
          availability_template: "{% if (is_state('switch.shelly_shsw_pm_006037', 'on' )) or (is_state('switch.shelly_shsw_pm_006037', 'off')) %}
          true
        {% else %}
          false
        {% endif %}"
        
   workinf version under developer tools template:
   
   {% if (is_state('switch.shelly_shsw_pm_006037', 'on' )) or (is_state('switch.shelly_shsw_pm_006037', 'off')) %}
              true
            {% else %}
              false
            {% endif %}