Hi I have Maya but I do not use UE5
from what I understand the process of converting XGen hair for export to UE5 as alembic is extremely labor intensive but this ($$paid$$) mel script can speed up the process
it seems
As much as I love Maya’s Xgen hair it may be more practical to send your CC4 characters directly to UE5 and sort out a UE5 hair groom in UE5 as people have been doing it since the CC3 days apparently