I am also a really newbie in Swift and the Apple Ecosystem, and I found useful Paul Hudson's videos published on his YT channel. A very good video tutorials about Swift UI.
Mobilepadawan
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Maybe here we can use the term HTML5 Apps instead of PWA.
;)
I think you can try the autoplay() function using a SetTimeOut() in JS. Why?
The last year I've been working as instructor in a course about Web Apps ecosystem covering the major device platforms. When I did the class where the users learnt about Voice Synthesis the Web Apps, after using Add to home screen, don't load automatically the list of voices and languages available on the platform.
We tried for a few minutes using await, async, (and also avoid ;) and we don't got the solution.
Finally we solved using a non-good-practice in the "Codes of code": We detect the platform and in those case where the automatically voices loading do not work, we start a JS SetTimeOut() after a few seconds we called the function to load the list of voices and voilá. It works fine!
In some cases the non-good-practices became in an emergency-well-practices.