[{"_id":"336277029060345856","characters":[{"name":"druu","scores":[{"date":"09/03/23","score":41},{"date":"09/03/23","score":12},{"date":"09/03/23","score":52},{"date":"09/03/23","score":100}]},{"name":"druuwu","scores":[]}]}]

db.collection.aggregate([{"$unwind":"$characters"},{"$match":{"characters.name":"druu"}},{"$set":{"characters.scores":{"$sortArray":{"input":"$characters.scores","sortBy":{"score":-1}}}}}])