Anki TTS: window.speechSynthesis.getVoices() is empty

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Hello, I’m trying to use window.speechSynthesis.getVoices() for my anki project, but it’s always empty. Is there any workaround ?

I cannot use the {{tts…}} thingy because I load my app right into anki:

<div id="siteloader"></div>​
<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<script>
    $("#siteloader").html('<object data="http://localhost:3001/word/{{Word}}>');
</script>

In my app I use the node package speak-tts - because I was too lazy to code some of the features it provides - but, long story short, here’s what it does - and what I need to work - :

function speak(word) {
  const speech = new SpeechSynthesisUtterance();
  speech.text = word;
  speech.volume = 1; // 0 to 1
  speech.rate = 1; // 0.1 to 9
  speech.pitch = 1; // 0 to 2, 1=normal
  speech.voice = typeof window !== 'undefined' && window.speechSynthesis.getVoices().filter((v) => v.lang == 'ja-JP')[0];
  speechSynthesis.cancel();
  speechSynthesis.speak(speech);
}

The TTS works in my browser but won’t in anki, so I’m guessing the issue lies within what chromium flags anki uses.