The industry standard for digital Braille files is BRF. It is so pervasive that even the United States IRS (Internal Revenue Service) provides their tax forms as downloable BRF digital Braille files. (See this link on the IRS website:
https://www.irs.gov/forms-pubs/irs-tax-forms-in-braille-and-text-formats ).
The problem is that when a Braille teacher with normal sight is helping a blind person, these BRF digital Braille files need to be view-able to the sighted Braille teacher on a normal display, while at the same time being available in raised bump format on a USB attached Braille reader.
This is simple to do on Windows and MAC because a free "SimBraille" font is readily available. Simply download and install "SimBraille" and you can open any .BRF digital Braille file in a word processor-- the BRF file will appear visually in perfect 2 dimensional Braille characters dots. (To learn more about and to download the SimBraille font for reading BRF files, see this website:
http://www.brl.org/simbraille.html )
I would very much appreciate as much community support as possible to raise the profile of this issue with the Google Accessibility team. Currently, it is impossible to install "SimBraille" as a font on a Chromebook, and even on a MAC or a PC that has SimBraille installed it is impossible to use Simbraille with Google Docs because only WebFonts from Google are permitted.