minecraft-assets/data/minecraft/loot_tables/blocks/cyan_banner.json

{
  "type": "minecraft:block",
  "pools": [
    {
      "rolls": 1,
      "entries": [
        {
          "type": "minecraft:dynamic",
          "name": "minecraft:self"
        }
      ]
    }
  ],
  "functions": [
    {
      "function": "minecraft:explosion_decay"
    }
  ]
}