🧩 Composite

https://minecraft.wiki/w/Items_model_definition#composite

Render multiple sub-models in the same space.

default:composite_item:
  model:
    type: "minecraft:composite"
    models:
      - type: minecraft:model
        path: "minecraft:item/custom/model_1"
      - type: minecraft:model
        path: "minecraft:item/custom/model_2"
      - type: minecraft:model
        path: "minecraft:item/custom/model_3"