There is text-to-speech tool build into macOS that you can use in a script to convert any text file to .mp3 audiobook: https://gist.github.com/ivanistheone/de3ccb244224d101bb93320...
I use the script fro certain longer books (usually fiction), but in general just tend to select text and press a keyboard shortcut, see here for how to set this up https://docs.google.com/document/d/1mApa60zJA8rgEm6T6GF0yIem...
Here is a sample if you want to hear what it shouds like: https://minireference.com/static/tmp/constructive_feedback.m... src https://productivityhub.org/2019/04/19/how-to-deliver-constr...