Is there a way to retain the previous attribute with trigger sensor?

Configuration
3

I finally found some inspiration from here. This seems to be working well.

template:

  - trigger:
      - platform: state
        entity_id: binary_sensor.living_room_zone_motion
        not_from:
          - unknown
          - unavailable
        variables:
          to_state: "{{trigger.to_state.state}}"
          last_changed: "{{ trigger.to_state.last_changed.isoformat() }}"
    binary_sensor:
      - name: Test Attribute Overwrite
        state: "{{ trigger.to_state.state }}"
        attributes:
          last_on: |-
            {% set current = this.attributes.get('last_on', {}) %}
            {{ last_changed if to_state == 'on' else current }}
          last_off: |-
            {% set current = this.attributes.get('last_off', {}) %}
            {{ last_changed if to_state == 'off' else current }}
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