[{"_id":ObjectId("65d8fd25618ef79985233636"),"name":"John","hobbies":["a","b"],"islandItems":["c","d"],"superPower":"e"}]

db.collection.update({_id:ObjectId("65d8fd25618ef79985233636")},[{$set:{questionAnswers:{hobbies:"$hobbies",islandItems:"$islandItems",superPower:"$superPower"}}}])