[{"_id":{"$oid":"6556e6dded0e30c020c26da7"},"entries":[{"userId":"801555002664419351","lotteryNumber":[1,2,7,9],"dateSubmitted":{"$date":"2023-11-17T04:07:02.783Z"}},{"userId":"801555002664419352","lotteryNumber":[5,6,7,8],"dateSubmitted":{"$date":"2023-11-17T04:07:02.783Z"}},{"discordId":"801555002664419353","lotteryNumber":[4,3,1,6],"dateSubmitted":{"$date":"2023-11-17T04:07:02.783Z"}}]}]

db.collection.aggregate([{$match:{"entries.lotteryNumber":{$in:[1,2,3]}}},{"$addFields":{"entries":{"$map":{"input":"$entries","as":"e","in":{"$mergeObjects":["$$e",{lotteryMatchingCount:{$size:{"$setDifference":["$$e.lotteryNumber",{"$setDifference":["$$e.lotteryNumber",[1,2,3]]}]}}}]}}}}}])