Search sent me here looking for the same.
The CommonActionWidget failed for me for displaying the KeyboardsMouse data with Enhanced Input actions.
For the icon you can use
CommonUI->GetEnhancedInputActionButtonIcon()
If you are in C++
CommonUI::GetIconForEnhancedInputAction(GetInputSubsystem(), EnhancedInputAction);
Working in current project on 5.2 with player mappable keybindings and console/controller/pc support.