chiyuv mezomos for wife of an eved

"Im ba'al isha hu v'yatza'ah ishto imo". Rashi asks the obvious question of what the eved's wife should have to do with his and quotes from Chazal that the owner of the eved was chayav to pay mezonos support to the wife of the eved. Once the eved was freed, that obligation is severed. Question: can the eved be mocheil (forgive the obligation) on the chiyuv mezonos to his wife? In other words, is the chiyuv of the owner to the eved to provide food for him to use as mezonos, or is there a chiyuv from the owner directly to Mrs. Eved? I don't have an answer for this one.