Enable SpeechSynthesis within Zotero?

I'd like to create a plugin that uses the Javscript SpeechSynthesis ( https://developer.mozilla.org/en-US/docs/Web/API/SpeechSynthesis ) API to read out documents, however, it seems this feature is not present within the current version of Javascript running in Zotero.

What JS engine is running within Zotero, is it possible to enable this feature?
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