It would feel a bit redundant if they did Evil Author/ Good Author again–it’s a bit Isaac and Henry even if *the* book isn’t directly involved. Also, how would the show incorporate them? Unless they say that the Brothers Grimm were from Fictional Germany and not our land (which, ugh).
Remember the movie, they were witch hunters there and who knows maybe is time to bring home office agan, to try to destroy magic world, and these are like descendents from the real bothers grimm, or heck they may come from the fictional whatever country they decide.
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"I offended you with my opinion? Ha, you should hear the ones I keep to myself".