minecraft-src/data/minecraft/worldgen/placed_feature/end_platform.json

{
  "feature": "minecraft:end_platform",
  "placement": [
    {
      "type": "minecraft:fixed_placement",
      "positions": [
        [
          100,
          49,
          0
        ]
      ]
    },
    {
      "type": "minecraft:biome"
    }
  ]
}