minecraft-assets/data/minecraft/worldgen/configured_feature/pile_ice.json

{
  "type": "minecraft:block_pile",
  "config": {
    "state_provider": {
      "type": "minecraft:weighted_state_provider",
      "entries": [
        {
          "data": {
            "Name": "minecraft:blue_ice"
          },
          "weight": 1
        },
        {
          "data": {
            "Name": "minecraft:packed_ice"
          },
          "weight": 5
        }
      ]
    }
  }
}