Send message on Sonos speakers when washing machine is done

sonos_info_message.yaml

alias: Washing machine done
description: ''
trigger:
  # power consuption below 3W for 5 minutes
  - platform: numeric_state
    entity_id: sensor.washing_machine_power
    below: '3'
    for: '00:05:00'
condition: []
action:
  # save state of all involved Sonos players
  - service: sonos.snapshot
    data:
      entity_id: media_player.buro
  - service: sonos.snapshot
    data:
      entity_id: media_player.kuche
  - service: sonos.snapshot
    data:
      entity_id: media_player.wohnzimmer_tv
  # stop whatever is currently playing
  - service: media_player.media_stop
    data:
      entity_id: media_player.buro
  - service: media_player.media_stop
    data:
      entity_id: media_player.kuche
  - service: media_player.media_stop
    data:
      entity_id: media_player.wohnzimmer_tv
  # group Sonos players
  - service: media_player.join
    data:
      group_members:
        - media_player.buro
        - media_player.kuche
        - media_player.wohnzimmer_tv
    target:
      entity_id: media_player.buro
  # adjust volume for each speaker to our taste
  - service: media_player.volume_set
    data:
      volume_level: 0.3
    target:
      entity_id: media_player.buro
  - service: media_player.volume_set
    data:
      volume_level: 0.4
    target:
      entity_id: media_player.kuche
  - service: media_player.volume_set
    data:
      volume_level: 0.25
    target:
      entity_id: media_player.wohnzimmer_tv
  # play message on Sonos group (file is in www/mp3/...)
  - service: media_player.play_media
    target:
      entity_id: media_player.buro
    data:
      media_content_type: music
      # generate media at https://ttsmp3.com/
      media_content_id: http://homeassistant.local.ip/local/mp3/washing_machine_done.mp3
      announce: true
  # wait until message has finished playing
  - delay:
      hours: 0
      minutes: 0
      seconds: 3
      milliseconds: 0
  # dissolve Sonos group
  - service: media_player.unjoin
    data: {}
    target:
      entity_id:
        - media_player.buro
        - media_player.kuche
        - media_player.wohnzimmer_tv
  # restore old player states
  - service: sonos.restore
    data:
      entity_id: media_player.buro
  - service: sonos.restore
    data:
      entity_id: media_player.kuche
  - service: sonos.restore
    data:
      entity_id: media_player.wohnzimmer_tv
  # turn of outlet to minimize standby consumption
  - service: switch.turn_off
    data: {}
    target:
      entity_id: switch.washing_machine
mode: single