lunar-assets/minecraft/post_effect/chroma_core.json

{
  "passes": [
    {
      "program": "minecraft:v1_21_2/program/chroma_core",
      "output": "minecraft:main",
      "inputs": [
        {
          "sampler_name": "In",
          "target": "minecraft:main"
        }
      ]
    }
  ]
}