Inpatient hepatology probably exists only in large university based practice. If you are doing transplant, you can find list of all transplant centers statewide and check for openings there. You will have largely outpatient practice with call every few days or a week at a time(depending on the center). Outside of transplant centers, a true hepatologist need is less, so you will see a blend of general GI and liver stuff.
AASLD doesn't officially release data on this but about 25% spots go unfilled usually.