Positioned Item Stack

Data Type.

An Object which defines a new item stack alongside a position in an inventory. Basically an Item Stack with a slot field.

Fields:

Field	Type	Default	Description
item	Identifier		ID of a registered item.
amount	Integer	1	Size of the stack.
tag	String	optional	NBT data of the item.
slot	Integer	optional	Inventory slot position of the stack. If not specified, will be the first free slot in the inventory. See Positioned Item Stack Slots for possible values

Example:

"stack": {
    "item": "minecraft:shield",
    "slot": 40
}

An item stack of a shield positioned in the off-hand slot of the player inventory.