superb-warfare/src/main/resources/data/superbwarfare/loot_modifiers/common_chest.json

{
  "type": "superbwarfare:superbwarfare_loot_modifier",
  "conditions": [
    {
      "condition": "neoforge:loot_table_id",
      "loot_table_id": "minecraft:chests/simple_dungeon"
    }
  ],
  "lootTable": "superbwarfare:chests/blue_print_common"
}