Loot table condition example

    {
    "pools": [
        {
            "rolls": 1,
            "items": [
                {
                    "item": "minecraft:stone",
                    "weight": 1,
                    "functions": [
                        {
                            "function": "set_count",
                            "count": 4,
                            "conditions": [
                                {
                                    "function": "killed_by_player"
                                }
                            ]
                        }
                    ]
                }
            ]
        }
    ]
}