Google Cloud Text to speech api in Flutterflow

Hey guys,

In an app I am currently developing, I need a good text to speech functionality. For that I want to use an api and I think the Google cloud text to speech api is just the best api on the market (https://cloud.google.com/text-to-speech/?utm_source=google&utm_medium=cpc&utm_campaign=emea-ro-all-en-dr-bkws-all-all-trial-b-gcp-1011340&utm_content=text-ad-none-any-dev_c-cre_654621767022-adgp_Hybrid+%7C+BKWS+-+BRO+%7C+Txt+~+AI+%26+ML+~+Text-to-Speech-kwid_43700075997020393-kwd-496508578319-userloc_1011795&utm_term=kw_google%20text%20to%20speech-net_g-plac_&&gad_source=1&gclid=CjwKCAiA04arBhAkEiwAuNOsIn0u8DPp5Na0LfMqZYM3QhPWzjnAEb3ReOKZVBJxgEdRWLAhsJoskhoC4jIQAvD_BwE&gclsrc=aw.ds).

I have used APIs before but I’m not that sure, how to use this api in Flutterflow.

URL:

https://texttospeech.googleapis.com/v1beta1/text:synthesize

Example JSON:

{
  "audioConfig": {
    "audioEncoding": "LINEAR16",
    "effectsProfileId": [
      "small-bluetooth-speaker-class-device"
    ],
    "pitch": 0,
    "speakingRate": 1
  },
  "input": {
    "text": "Google Cloud Text-to-Speech enables developers to synthesize natural-sounding speech with 100+ voices, available in multiple languages and variants. It applies DeepMind’s groundbreaking research in WaveNet and Google’s powerful neural networks to deliver the highest fidelity possible. As an easy-to-use API, you can create lifelike interactions with your users, across many applications and devices."
  },
  "voice": {
    "languageCode": "en-US",
    "name": "en-US-Studio-O"
  }
}

Can you guys maybe tell me how exactly I can use this api in my Flutterflow project to play the text to speech as an audio and also where I need to put the api key.

Thanks a lot!

Greetings

Benjamin