This page relates to Yanny's Stone Age, which has built-in support!

import mods.stone_age.FlintWorkbenchManager;

ZenScript
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<recipetype:stone_age:flint_workbench>.addRecipe(String name, IItemStack output, IIngredient[][] inputMatrix, IIngredient tool, @OptionalString String group)

<recipetype:stone_age:flint_workbench>.addRecipe("cobblestone", <item:minecraft:cobblestone>, [[<item:minecraft:dirt>, <item:minecraft:dirt]], <item:minecraft:emerald>);
FlintWorkbenchManager.INSTANCE.addRecipe("cobblestone", <item:minecraft:cobblestone>, [[<item:minecraft:dirt>, <item:minecraft:dirt]], <item:minecraft:emerald>);