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

{
  "format_version": "1.8.0",
  "render_controllers": {
    "controller.render.axolotl": {
      "arrays": {
        "textures": {
          "Array.skins": [ "Texture.lucy", "Texture.cyan", "Texture.gold", "Texture.wild", "Texture.blue" ]
        }
      },
      "geometry": "Geometry.default",
      "materials": [
        { "*": "Material.default" },
        { "*arm": "Material.limbs" },
        { "*leg": "Material.limbs" }

      ],
      "textures": [ "Array.skins[query.variant]" ]
    }
  }
}