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db.collection.aggregate([{"$set":{"charges":{$objectToArray:"$charges"}}},{"$set":{"charges":{$map:{input:"$charges",in:{k:"$$this.k",v:{$split:["$$this.v",","]}}}}}},{$set:{charges:{$map:{input:"$charges",in:{k:"$$this.k",v:{"$trim":{"input":{$reduce:{input:{$map:{input:[1,2],as:"i",in:{$arrayElemAt:["$$this.v","$$i"]}}},initialValue:"",in:{$concat:["$$value",",","$$this"]}}},"chars":","}}}}}}},{$set:{charges:{$arrayToObject:"$charges"}}}])