The best champs not in lane to counter Jhin include Naafiri, Gragas, and Nidalee. These champs are all good at countering Jhin with decent win rates over 53%. Even if these Jhin counter picks are not picked in the same position as you, it's not a good idea to choose him into one of these matchups. They will often destroy Jhin.
Yet, if the opposite team brings either Rumble or Maokai, Jhin mains should strongly consider taking him, as he easily destroys these champions with win rates over 55% against each ofthem.