Loot Table of luck to be killed by a monster player invalid

1. Write a LootTable.
Like this:

{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:iron_ingot",
                    "weight": 1,
                    "luck": -100
                }
            ]
        }
    ]
}

2. Save to .minecraft \ saves \ map \ data \ loot tables \ command \ loot table

3./effect @p minecraft:luck 3000 0
4./summon Zombie ~ ~ ~ {DeathLootTable:command:loottable}
5. to kill the zombie
6. The zombie will loot iron_ingot(If you are in luck effect)