[{"_id":ObjectId("5f872944677379aa96761ae1"),"name":"test","labels":["test1"]},{"_id":ObjectId("5f872944677379aa96761ae2"),"name":"test","labels":["test1","test2"]},{"_id":ObjectId("5f872944677379aa96761ae3"),"name":"test","labels":["test2"]}]

db.collection.find({"labels":"test2"})