The CSV list import is an option in the maplist impost but is not functionnal. I just tested it on complexsystems.gargantext.org with the attached WL.

This functionnality is very important to help people to migrate from V3 to V4 but also to make it possible to import list in format that are more readable although less powerfull (no multi-level list)

complexSystems_Top15k_2020_WL2.csv

Affect of importing a maplist with CSV option :