HA - Trigger based on Alexa alarm with offset

alexa_alarm_offset_trigger.yaml

alias: Pre-Alexa alarm trigger template
description: ""
trigger:
  - platform: template
    value_template: >-
      {% set alarm_time = states('sensor.amanda_s_living_room_dot_next_alarm') |
      as_datetime %}

      {% if alarm_time != None %}

      {% set mins_before = 2 %} 
        {{ now() >= alarm_time - timedelta(minutes=mins_before) }}
      {% else %} False {% endif %}
condition: []
action:
  - service: light.turn_on
    data: {}
    target:
      entity_id: light.behind_tv
mode: single