"container_type": "CHEST" (.json-file)

Hi,
lately i was working a bit on the Origins-Bukkit plugin, messing around with the powers, custom origins etc. and i found the extra inventoryspace of the origin shulker and created my own power using that as an the base. My problem is that in the power-.json-file is "container_type": "DROPPER" (i changed it to chest) and i don't know how to specify that the container type should be a double chest, cuz when i looked into the container/inventory types on the official spigot page (InventoryType -> Enum Constant Details), there only stood that container_type is chest with possible space of 27,36,45,54 inv spaces, but not how to specify the amount of slots:



Thats why i wanted to ask whether sb can help me with that.
power.json-file:

{
"type": "origins-bukkit:inventory",
"title": "Pocket Dimension",
"container_type": "CHEST",
"key": "PRIMARY",
"name": "&f&nPocket Dimension&r &8&n(Active ability, use with [F])",
"description": [
"&7Because of spatial magic you have 30 more inv-slots.",
"&7Even after death the items don't disappear."
]
}

 

oh, oki ty ^^