The tag c:hidden_from_recipe_viewers seems to be commonly used to indicate that an item should not be displayed in a recipe viewer like JEI, EMI, REI, etc. (I checked in the code for at least these three and they do.)

Currently, the categories added by this mod do not respect that tag.

Expected behavior
Any item with the c:hidden_from_recipe_viewers tag should not be displayed in any categorie/tab.
This includes Enchantment, Dungeon Chests, Village Trades, etc.