fabric-example-mod/src/main/resources/data/examplemod/loot_tables/blocks/block_of_charcoal.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "conditions": [
        {
          "condition": "minecraft:survives_explosion"
        }
      ],
      "entries": [
        {
          "name": "examplemod:block_of_charcoal",
          "type": "minecraft:item"
        }
      ],
      "rolls": 1
    }
  ]
}