This is available on the website, and the extension already has a "Listen to Audio" button so you can hear the translation. But it would be useful for the extension to also have an option to play the translated words.
Typically if you are translating from a language you don't know, to a language you do know, you'll know how to pronounce the words in your own language. So it's more useful to be able to hear how the language being translated sounds.