Homeassistant - count lights that are on in specific areas

lights_on.yaml

template:
  - sensor:
    - name: Lights on
      icon: mdi:lightbulb
      state: >-
        {% set exclude_areas = [None, 'Volvo'] %}
        {{ states.light | selectattr('state', 'eq', 'on') | map(attribute='entity_id') | map('area_name') | reject('in', exclude_areas) | list | count }}
      attributes:
        areas: >-
          {% set exclude_areas = [None, 'Volvo'] %}
          {{ states.light | selectattr('state', 'eq', 'on') | map(attribute='entity_id') | map('area_name') | reject('in', exclude_areas) | unique | list }}