I found a workaround using the same reader as Snaphu import.
- Rename the connected component file with extension .img
- Copy the unrapped header file that Snaphu export creates to be the header for the connected component file (same name but with .hdr ext).
- Edit the header file and change data type from 4 (int32) to 1 (unint8).
- Read using Snaphu import (needs the interferogram again)
- The connected component band will be named Unw_Phase_ifg_*