In the Tips it's mentioned, that text between square brackets is not spoken. Unfortunately, this isn't working right now.

Text between square brackets should not be spoken.
Unfortunately, this isn't working right now! 

e.g.
I’ve this row as part of my text...
[ 8–13s (two design options, 2x2 vs 1x4 5G array, dB results) ]
and it’s finally spoken after generating the Audio