[{"_id":"0cc5c468-2105-11ee-ad68-15d467e62by4d","storeId":"3070","paymentType":"cash","total":{"$numberDecimal":"100"}},{"_id":"1111111-2105-11ee-ad68-15d467e62by4e","storeId":"3070","paymentType":"cash","total":{"$numberDecimal":"100"}},{"_id":"0cc5c468-2105-11ee-ad68-15d467e62by4f","storeId":"3070","paymentType":"creditCard","total":{"$numberDecimal":"50"}}]

db.collection.aggregate([{$group:{_id:{storeId:"$storeId",paymentType:"$paymentType"},total:{$sum:"$total"}}},{$group:{_id:"$_id.storeId",paymentType:{$push:{"k":"$_id.paymentType",v:"$total"}},"total":{$sum:"$total"}}},{"$replaceWith":{"$arrayToObject":{"$concatArrays":["$paymentType",[{"k":"storeId","v":"$_id"},{"k":"Total Amount","v":"$total"}]]}}}])