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

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