[{"username":"john1234","password":1234,"enrollment":[{"courseName":"NIE-SW101","courseTime":ISODate("2022-12-01T09:00:00Z")},{"courseName":"NIE-HI101","courseTime":ISODate("2022-12-05T15:00:00Z")}]}]

db.collection.update({"username":"john1234"/** from req.body.username*/},{"$set":{"enrollment.$[course].newObject":{/** from req.body.xxx*/"date":ISODate("2022-12-01T09:00:00Z"),"attendance":true}}},{"arrayFilters":[{/** from req.body.courseName*/"course.courseName":"NIE-SW101"}]})