I assume that you are talking about the 'status bar' that is located on the bottom of each Pane (i.e. the Map View).
Currently there are no methods in the Pro API that allow customizing this status bar. You can use "ArcGIS Pro SDK Ideas" to suggest this feature for a future release.
The problem with embeddable control is, it will cover some portion of map ( which is quite annoying for user ).
I have one more question do i have provision to add more coordinate system in status bar or show multiple coordinate system rather than showing only one at a time.