[{"_id":"5f11d4c48663f32e940696ed","Widgets":[{"WidgetId":663,"Name":"Super Widget 2.0","Created":null,"LastUpdated":null}],"Status":3,"LastUpdated":null,"Created":"2018-11-09T18:22:16.000Z"}]

db.collection.aggregate([{"$addFields":{"Widgets.Created":"$Created"}}])