[{ordernumbers:1001,items:"testitems",orderlogss:[{"ctr":{"$oid":"6106d15ca48148060dbbec69"},"stat":"Ordered","time":1627836764264},{"ctr":{"$oid":"6106d15ca48148060dbbec68"},"stat":"Ordered","time":1627836764265},{"ctr":{"$oid":"6106db35abcea00b8d901035"},"stat":"Registered","time":1627839285518},{"ctr":{"$oid":"6106db893a008e1a0112b8d8"},"time":1627839369359},{"ctr":{"$oid":"6106db8f3a008e1a0112b922"},"stat":"Dispensed","time":1627839375597}]}]

db.collection.aggregate([{$project:{itemfinal:"$items",ordernumberfinal:"$ordernumbers",rows:{$arrayToObject:{$map:{input:"$orderlogss",in:{"k":{"$ifNull":["$$this.stat","replacement-stat"]},"v":"$$this.time"}}}},}},{"$addFields":{"rows.finalitem":"$itemfinal","rows.finalorder":"$ordernumberfinal"}},{"$replaceRoot":{"newRoot":"$rows"}}])