It's actually not too hard to do if you are just doing it for yourself by editing game files, but making ui for it would take a LOT of effort I don't really believe worth taking.
Maybe something to think about for a 3rd installment in that case (as well as more food types, where are diaries, eggs, or fruit categories)? The game already feature customerizable backstory, portrait and body image for the characters. Customerizable dialogue feels like a natural next step.
