Good day, Kim.
If I understand your question correctly, you are wondering how to transcribe the series of steps with comments at the end of your sample text.
It is almost certainly not necessary to indicate that the comment text is blue. Context should make it abundantly clear to the reader what is part of the math expression and what is comment. Add to that the use of Nemeth Code switch indicators as illustrated in the attached files, and your braille reader should be very well off.
An image of the appropriate braille is attached as well as a BRF. [I am afraid it is not possible to attach a Braille2000 file at this time.]
Thank you for your question.