yes, 3 lanes in total. That would be:

lanes=3
lanes:forward=2
lanes:backward=1

turn:lanes:forward=left|through;right


the forward/backward depends on the direction of the line, which you can determine based on these subtle arrows which appear when you select a line: https://github.com/user-attachments/assets/3d3d60e1-7e12-4adb-89ae-a2c08481e004 