It would be extremely useful to be able to access webmap information (title, itemID etc.) via arcade, in much the same way as you can access layer information.
e.g. via the GetFeatureSetInfo function
This would allow data and attributes within the map to utilise this information.
I cannot currently see a way to do so.
Use case from one of my users was asking why they needed to enter a Project number in a form when the map title already contained it, which I thought was a very fair question!