Can you pass subsitution variable in a Template like Switch

hi in esphome you can use subsitutions and variables… as i wanna be able to change 1 line in switch template and it just used through out… instead of needing to change swtich name 3 4 times
so my example is

  switch:
    - platform: template
      switches:
        dehumidifier_1:
          friendly_name: "Dehumidifier 1"
          value_template: "{{ is_state('switch.mini_plug_1', 'on') }}"
          turn_on:
            action: switch.turn_on
            target:
              entity_id: switch.mini_plug_1
          turn_off:
            action: switch.turn_off
            target:
              entity_id: switch.mini_plug_1
          icon_template: >-
            {% if is_state('switch.dehumidifier_1', 'on') %}
              mdi:air-humidifier
            {% else %}
              mdi:air-humidifier-off
            {% endif %}

and what i wanna do is

  switch:
    - platform: template
      switches:
        dehumidifier_1:
          friendly_name: "Dehumidifier 1"
          switchname: "switch.mini_plug_1"
          value_template: "{{ is_state('{{switchname}}', 'on') }}"
          turn_on:
            action: switch.turn_on
            target:
              entity_id: { { switchname } }
          turn_off:
            action: switch.turn_off
            target:
              entity_id: { { switchname } }
          icon_template: >-
            {% if is_state('switch.dehumidifier_1', 'on') %}
              mdi:air-humidifier
            {% else %}
              mdi:air-humidifier-off
            {% endif %}

but of course it doesnt work that way… but can i do that ? does the template card let you do stuff like this where you can sub 1 line and it gets referenced so your not having to change multiple spots…

also trying to do color icon but it doesnt like it… i tried this

          icon_color: >-
            {% if is_state(switch.dehumidifier_1), 'on' %} 
              yellow
            {% elif is_state(switch.dehumidifier_1), 'off' %}
              green
            {% else %}
              blue
            {% endif %}

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