ArcGIS Online/Portal Embedded Maps - Add "Bookmark" configuration parameter

[GregYoung]

When embedding an ArcGIS Online web map in a website, there are a number of configuration parameters that can be set (Use URL parameters to modify embedded maps—ArcGIS Online Help | ArcGIS ).  I would like to see a new parameter added that allows one to specify a pre-existing bookmark from the map which will define the initial extent.  I know there is already an "extent" parameter but it would be way more convenient in many cases to define extents in advance and access them via the bookmark name.

[MelissaBrooks]

We are designing more and more integrated maps embedding them directly into websites rather than creating a standalone app. This addition would be really helpful (in our case, Local Government) where we have standard communities to highlight but a range of maps/topics embedded throughout our website.