We are waiting for an answer for whether formal species groups will be added as a separate rank.
https://forum.inaturalist.org/t/create-a-new-taxon-rank-for-inaturalist-the-species-group/14543
Knowing the answer to that question would help figure how to approach certain complexes.
Sometimes the monophyly check for a potential few-species complex isn’t very conclusive, but the complex is inside a formal species group, which is described to be likely monophyletic. Without the group rank, if the species group is added at the complex rank, then probably all groups in the genus or subgenus should also be added, leaving no rank for further complexes within sister groups. If species groups could be added at their own rank, then some of the potential complexes are not so necessary, and those that remain necessary still have a rank available for them.