Notation - double stop for divided strings

When all players in a string section are playing the same part, there is no special notation for double stops. But when the section is divided, and one subsection of players are playing double stops, this is noted with a vertical bar next to the double-stop notes, with short horizontal lines pointing at the notes. This is shown in the first measure of the pdf file, where one subsection of celli are playing e and the other subsection is playing double stops D-F#.

I would like to see this notation developed in MuseScore.