Hi,
I am trying to find a way to add a new button to either the top title bar (where the notifications and username appears) or in the action pane (where buttons like close, popout, powerapps) are present.

Basically somewhere in the above picture.
I tried searching for this and looks like we cannot add to the title bar at least. For the action pane I found the SysSystemDefinedButtons class which adds and enables the buttons on the action pane. But I was unable to create an extension of this class. Is it possible to modify this class to add a custom button to the action pane ?
The base requirement is to add a button such that it is available/visible on every page. Is it possible to achieve this in any way ?