[{timestamp:ISODate("2022-05-11T12:38:01.537Z"),positions:[{detail:1,name:"name",importantNumber:50,arrayOfTokens:[{tokenName:"name",tokenSymbol:"symbol",tokenPrice:1,tokensEarned:10,baseAssetValueOfTokensEarned:10,},{tokenName:"name2",tokenSymbol:"symbol2",tokenPrice:2,tokensEarned:10,baseAssetValueOfTokensEarned:20,},],},{detail:1,name:"name",importantNumber:30,arrayOfTokens:[{tokenName:"name",tokenSymbol:"symbol",tokenPrice:1,tokensEarned:10,baseAssetValueOfTokensEarned:10,},{tokenName:"name2",tokenSymbol:"symbol2",tokenPrice:2,tokensEarned:10,baseAssetValueOfTokensEarned:20,},],}]}]

db.collection.aggregate([{$unwind:{path:"$positions"}},{$group:{_id:{date:{$dateTrunc:{date:"$timestamp",unit:"day"}},name:"$positions.name"},importantNumber:{$sum:"$positions.importantNumber"},arrayOfTokens:{$push:"$positions.arrayOfTokens"}}}])