My mind is blown How do I add an inventory slot?

Bukkit inventory views – Raw slot IDs minecraft inventory slot An Integer that specifies the position of a positioned item stack Equipment Slots Item Stack Slot, item Slot, Inventory NBT Slot 40 minecraft slot png Also you would need to somehow override the vanilla minecraft gui or render your custom gui over the existing one Thats what i would think

minecraft elytra slot declaration: package: , class: Slot