bedrock-samples/resource_pack/render_controllers/iron_golem.render_controllers.json

{
  "format_version": "1.8.0",
  "render_controllers": {
    "controller.render.iron_golem_cracks": {
      "arrays": {
        "textures": {
          "Array.cracks": [
            "Texture.cracked_high",
            "Texture.cracked_med",
            "Texture.cracked_low",
            "Texture.cracked_none"
          ]
        }
      },
      "geometry": "Geometry.default",
      "textures": [ "Array.cracks[math.clamp(query.health / 25, 0, 3)]" ]
    }
  }
}