minecraft-assets/assets/minecraft/models/item/feather.json

{
    "parent": "item/generated",
    "textures": {
        "layer0": "item/feather"
    },
    "display": {
        "head": {
            "rotation": [ 0, 0, 45 ],
            "translation": [ -1, 13, 7],
            "scale":[ 1, 1, 1]
        }
    }
}