[miki123211]

Try playing with Mathjax's own accessibility settings. Not sure how well that works on Openstax, will work well if they're using Mathjax 3, badly otherwise.

Alternatively play with MathPlayer's settings (in the control panel), some of the other reading modes work better in certain contexts.

If you can, also try VoiceOver on the Mac, it has its own math support, which works pretty well.

We seem to be in similar situations, if you want to share tips or something, my hn username at gmail dot com.