I'm not sure you can have a specific shortcut to a property of an object.
But i do know that activating the "Joint Editor" tool will automaticaly show you all the bones of the object you have selected in your scene tab.
The default shortcut for the Joint Editor is: Alt-Shift-J
You can always return to the Node Selection Tools after that with: Alt-Shift-V
If you don't like these default shortcut, you can always go and edit them in:
Window->Workspace->Customize
(Then browse to the "Viewport Tools" tree and go chance the shortcut there.)