Hello!! I was just re-reading this thread and realized I never responded to this. What do you mean add to a string of text? 
I’m releasing an update soon that lets you automatically translate text to speech on the website (no phonetic writing needed) but if you want text-to-speech translation in-game, you’d probably need an algorithm to guess the pronounciations instead of a database due to Makecode’s size limits. The SAM extension uses this algorithm-- it will make more errors, but it does translate ingame. I’m thinking of making an in-game translator version, but that’s a distant plan at the moment!
(If you’re no longer working on the project you can ignore this 
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