Lyrics position information is not written/read in MusicXml format

MuseScore saves all text style information in a separate style file, but does not save it in the MusicXml format. Looking at Finale Notepad, when exporting to MusicXml it is saving information about the text font, size and lyrics positioning. We should start reading/writing this information to improve the experience of working with MusicXml files for MuseScore.