Database
[{_id:0,data:[{_id:ObjectId("61435b3c0f773abaf77a367e"),price:3000,type:"service",sellerId:ObjectId("61307abca667678553be81cb"),},{_id:ObjectId("613115808330be818abaa613"),price:788,type:"product",sellerId:ObjectId("61307abca667678553be81cb"),},{_id:ObjectId("61307c1ea667676078be81cc"),price:1200,type:"product",sellerId:ObjectId("61307abca667678553be81cb"),}]}]
Query
db.collection.aggregate([{$unwind:"$data"},{$group:{_id:{sellerId:"$data.sellerId"},"sumPrice":{$sum:"$data.price"}}},{"$group":{"_id":0,"data":{$addToSet:{"sellerId":"$_id.sellerId","sumPrice":"$sumPrice"}}}}])