minecraft-assets/data/minecraft/loot_tables/entities/shulker.json

{
  "type": "minecraft:entity",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:item",
          "name": "minecraft:shulker_shell"
        }
      ],
      "conditions": [
        {
          "condition": "minecraft:random_chance_with_looting",
          "chance": 0.5,
          "looting_multiplier": 0.0625
        }
      ]
    }
  ]
}