[{products:[{productId:"62aac8cfb5722d4c628a4a24",quantity:1,total:50,},],},{products:[{productId:"62aac8cfb5722d4c628a4a24",quantity:2,total:100,},{productId:"65fasd454daer57f2ads4c",quantity:2,total:100,},],},{products:[{productId:"62aac8cfb5722d4c628a4a24",quantity:5,total:200,},],}]

db.collection.aggregate([{$unwind:"$products"},{$group:{_id:"$products.productId",quantity:{$sum:"$products.quantity"},total:{$sum:"$products.total"}}},{"$project":{_id:0,productId:"$_id",quantity:1,total:1}}])