There are some forums where i can download a map over the different available worlds, for example: https://zwiftinsider.com/wp-content/uploads/2016/03/Watopia-2.04.pdf. In the maps, there are letters for the different crossings.
If Zwift also could have downloadable maps with “named” crossings, there could be a possibility to build my own routes, for example: Watopia A-B-C-G-H-G-H-I-J-G-C-B-A and save it like i do with my exercises.