Earlier quoted context omitted.
I extracted Narrator module from Firefox'es reader mode. It's not so good in other browsers though. On macOS, I'm using Alex voice. https://tts.cns.wtf/ https://github.com/python273/tts-app
I've tried this on Linux+Firefox, but it doesn't sound very good yet, I'm afraid.
Yeah, it's using OS's voices and usually they are quite robotic. But it's still quite useful if you want to upload a long text into your brain.
I'm also using Narrator in my HN reader (no settings for voice right now though, except localStorage['cfg-narrator-rate'] via devtools):