Você pode instalar espeak
$ sudo <package manager install> espeak
No lançamento do Chromium com --enable-speech-dispatcher
sinalize e utilize onvoiceschanged
evento
window.speechSynthesis.onvoiceschanged = e => {
const voices = window.speechSynthesis.getVoices();
console.log(voices);
}
window.speechSynthesis.getVoices();