At the moment it seems there is no possibility to:
Are any improvements planned in this area?
one way (but depend on the complexity of your environment/application) is to play with Tags and management zone in order to segregate service, process group, applications, Host you want to take under control (maybe a subset of application business transaction .. like payment).
Base on that you can use Tile, Custom chart and USQL to filter data and chart what you need and track using conversion goal.
You can export Custom charter / USQL via API
As i wrote this can work for small application/environment
Basically you can design one Dashboard (Holistic view) to be offered to the users. They can apply management zone base on need and create alert profile base on Management Zone (not sure work as you expected but better than nothing).
An example on Mobile channel base on OS