Synchronized switching between braille display and TTS audio

As a screenreader user, I want to be able to read an e-books on a braille display and after a while switch to audio and continue reading at the next paragraph of the e-book using the synthetic voice.

_Detail:_
Currently, e-books only contain an ink print version of the text.
It is easy to listen to the e-book using the synthetic voice of the Screenreader. But when switching to reading on the braille display that is also connected to the screenreader you don’t get good quality braille.

_Proposal:_
Using a digital text file format that contains the ink print version of the text as well as a pre-transcribed braille version of the text in Unicode braille characters that is synchronized with the ink print version.