core/homeassistant/components/assist_satellite/services.yaml

announce:
  target:
    entity:
      domain: assist_satellite
      supported_features:
        - assist_satellite.AssistSatelliteEntityFeature.ANNOUNCE
  fields:
    message:
      required: false
      example: "Time to wake up!"
      selector:
        text:
    media_id:
      required: false
      selector:
        text: