Using tts.google_say to announce a yaml file

I’m trying to rework a process from the ground up since I’m tired of endlessly parsing code to get the current configuration to work. In this case, I want to simplify the code to just to get it done and cross it off my list.

The problem is, I don’t know how to pass a yaml file to tts.google_say to speak it. The file I’m looking to have spoken is a briefing announcement with weather, drive time, AQI, door state, etc. Can I pass an !include like this?

  action:
    - service: tts.google_say
      data:
        cache: false
        entity_id: media_player.nesthubmaxec28
        message: !include ../templates/speech/briefing.yaml