[{"curl_detail":{"Curl1":{"attack_type":"attack1","flag":"Attack","curl_result":"Pass"},"Curl2":{"attack_type":"attack1","flag":"Attack","curl_result":"Pass"},"Curl3":{"attack_type":"attack2","flag":"Attack","curl_result":"Pass"},"Curl4":{"attack_type":"attack3","flag":"Attack","curl_result":"Fail"}}},{"curl_detail":{"Curl1":{"attack_type":"attack3","flag":"Attack","curl_result":"Pass"},"Curl2":{"attack_type":"attack2","flag":"Attack","curl_result":"Pass"},"Curl3":{"attack_type":"attack3","flag":"Pass","curl_result":"Pass"},"Curl4":{"attack_type":"attack1","flag":"Attack","curl_result":"Fail"}}}]

db.collection.aggregate([{"$addFields":{"curl_detail":{"$objectToArray":"$curl_detail"}}},{"$unwind":"$curl_detail"},{"$group":{"_id":"$curl_detail.v.attack_type","expected":{"$sum":{"$cond":[{"$eq":["$curl_detail.v.flag","Attack"]},1,0]}},"actual":{"$sum":{"$cond":[{"$eq":["$curl_detail.v.curl_result","Pass"]},1,0]}}}}])