This blueprint allows you to turn your AirTag into a Device Tracker. You can read the full guide at https://aguacatec.es/integrar-airtag-en-home-assistant/

Airtag_Device_Tracker.yaml

blueprint:
  name: 📍 AirTag Device Tracker
  description: 'This blueprint allows you to turn your AirTag into a Device Tracker. You can read the full guide at https://aguacatec.es/integrar-airtag-en-home-assistant/'
  source_url: https://gist.github.com/TitoTB/6a254ee214a6d6223f9a4b48a670705f
  domain: automation

  input:
    airtag:
      name: Airtag 
      description: 'Select the REST sensor you have created for your AirTag'
      selector:
        entity:
          domain:
          - sensor
          multiple: false
    home:
      name: Home Address
      description: 'Set the word(s) that identifies your home address (i.e. street name)'
      default: 'Avocado street'
      selector:
        text:

trigger:
  - platform: state
    entity_id: !input 'airtag'
  - platform: homeassistant
    event: start
condition: []
action:
  - variables:
      airtag: !input 'airtag'
      home: !input 'home'
  - service: device_tracker.see
    data:
      dev_id: "{{ state_attr(airtag, 'friendly_name') }}"
      location_name: |
        {% if home in states(airtag) %}
          home
        {% else %}
          not_home
        {% endif %}
      gps:
        - "{{ state_attr(airtag, 'lat') }}"
        - "{{ state_attr(airtag, 'lon') }}"
mode: single