IMoO/loot_tables/entities/evocation_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
                }
            }
          ]
        }
      ]
    },
    {
      "rolls": 1,
      "entries": [
        {
          "type": "item",
          "name": "minecraft:totem",
          "weight": 1,
          "functions": [
            {
              "function": "set_count",
              "count": {
                "min": 1,
                "max": 1
              }
            }
          ]
        }
      ]
	}
   ]
}