testitem.json

{
	"format_version": "1.20.10",
	"minecraft:item": {
		"description": {
			"identifier": "lunarwolf:test_item",
			"category": "Items"
		},
		"components": {
            "minecraft:max_stack_size": 1,
            "minecraft:icon" : {
                "texture": "test_item"
            },
            "minecraft:on_use":{
                "on_use":{
                    "event":"test"
                }
            }
	},
    "events":{
"test":{
    "run_command":{
        "command":[
            "say hello"
        ]
        }
      }

    }
  }
}