bedrock-samples/behavior_pack/loot_tables/entities/vindication_illager.json

{
  "pools": [
    {
        "rolls": 1,
        "entries": [
            {
                "type": "item",
                "name": "minecraft:emerald",
                "weight": 1,
                "functions": [
                    {
                        "function": "set_count",
                        "count": {
                            "min": 0,
                            "max": 1
                        }
                    },
                    {
                        "function": "looting_enchant",
                        "count": {
                            "min": 0,
                            "max": 1
                        }
                    }
                ]
            }
        ],
        "conditions": [
            {
                "condition": "killed_by_player"
            }
        ]
    }
  ]
}