Customcraft for Elytra

I want to make a customcraft like in the picture.
Im using Craftenhance fork https://www.spigotmc.org/resources/1-9-1-20-fork-custom-recipes-and-crafting-craftenhance.111998/
Is there a way to bring 2 elytras in the output slot?
Everytime I try it im holding 1 elytra .
image.png
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