See full script here: https://gist.github.com/ivanistheone/de3ccb244224d101bb93320... and this doc explains how you can setup a keyboard shortcut to turn any text selection into an audio book https://docs.google.com/document/d/1mApa60zJA8rgEm6T6GF0yIem...
Here is a sample if you want to hear what it sounds like: https://minireference.com/static/tmp/constructive_feedback.m...
which is the audio from this blog post https://productivityhub.org/2019/04/19/how-to-deliver-constr...
IMHO, the computer generated voice like Alex (the default voice on mac OS) sounds better because it doesn't try to do inflections or add human character when it is reading. The real-world narrators (voice actors) seem to add too much "character" into their reading, which me distracts from the story/content. The only exception is when the narration is done by the author, in which case I'd consider the narration as part of the work.