[
  {
    "operation": "shift",
    "spec":  {
      "rating": {
        "quality": {
          "value": "SecondaryRatings.quality.Value",     // 输出 SecondaryRatings.quality.Value：3
          "max": "SecondaryRatings.quality.RatingRange"  // 输出 SecondaryRatings.quality.RatingRange：5
        }
      }
    }
  }
]
//"SecondaryRatings.quality.RatingRange" 代表输出路径