Nexan-s_Custom_Resources/assets/minecraft/models/item/netherite_shovel.json

{
  "parent": "minecraft:item/handheld",
  "textures": {
    "layer0": "minecraft:item/netherite_shovel"
  },
  "overrides": [
    { "predicate": {"custom_model_data": 1}, "model": "custom:item/x_shovel"}
  ]
}