The short answer is no…
The long answer…
If a maturity level/label exists it will be on index 3,4 on nfinfo from Title Information->Load Title Details

"nfinfo": [
  "/images/imdb/tt1600194.jpg",
  "Hawaii Five-0",
  "Hawaii's top cops are reborn in this update of an iconic TV show. They may work in paradise, but there's enough crime to keep them working overtime.",
  "90", <-maturity level
  "dialogue, language, sexual situations and violence", <-maturity label
  "4.2525377",
  "series",
  "2016-03-25 08:24:40",
  "2015-04-14 12:11:47",
  "2010",
  "70176866",
  "na",
  "http://cdn6.nflximg.net/ipl/29419/6c9964339f41c9c0d5fce6d030708bbbaff66eb3.jpg"
],

As in the BBFC rating, sometimes know on Netflix as ‘maturity rating’