Add SSML support to Home Assistant Cloud TTS

[TheFes]

Integration name

Home Assistant Cloud

Link to integration documentation on our website

https://www.home-assistant.io/integrations/cloud/

Describe the enhancement

Currently Nabu Casa TTS only supports providing a message, but Microsoft Azure TTS which is used by Home Assistant TTS also supports SSML.

This allows putting emphasis on words, adding sounds effects, adding pauses etc.

The Google Cloud TTS action supports SSML, and using that I made the following action to generate a message when someone is at the door when someone in the houseshold is celebrating their birthday (normally the variables in the first line are generated somewhere else in the automation, and normally it's in Dutch, I translated it for this example):

action: tts.google_cloud_say
data:
  entity_id: media_player.martijn
  language: en-US
  options:
    gender: male
    voice: en-US-Wavenet-F
  message: >
    {% set ha_url, name = 'https://foo.bar.bla', 'Birthday Boy' %}
    <speak>
      <par>
        <media repeatCount="2" soundLevel="+2.28dB"
          fadeInDur="2s" fadeOutDur="0.2s" begin="0s">
          <audio
            src="{{ ha_url }}/local/misc/roltong2.mp3"/>
        </media>
        <media xml:id="hooray" begin="0.5s">
          <speak><emphasis level="strong">Hooray!</emphasis></speak>
        </media>
        <media begin="hooray.begin+0.5s" soundLevel="-2dB"
          fadeInDur="2s" fadeOutDur="0.2s">
          <audio
            src="{{ ha_url }}/local/misc/roltong1.mp3"/>
        </media>
        <media xml:id="door" begin="hooray.end+1.5s">
          <speak>There's someone at the door! Maybe it's a guest for {{ name }}!</speak>
        </media>
        <media begin="door.end-0.2s" soundLevel="-6dB">
          <audio
            src="{{ ha_url }}/local/misc/roltong2.mp3"/>
        </media>
      </par>
    </speak>

This generates the message which can be found in this forum topic where I also posted this during the week of the WTH

It would be great if SSML would also be supported in the Home Assistant cloud TTS action. There is documentation by Microsoft here, so I would expect it to be supported by Azure TTS which is used by Home Assistant Cloud TTS.

Use cases

See above

Anything else?

No response

[github-actions[bot]]

🏷️ I've automatically added the integration: cloud label to help categorize this feature request.