With a little C++ code you can make a new userwidget baseclass that allows this, just be careful.
https://wiki.unrealengine.com/UMG_Previewing_custom_UserWidgets_in_realtime
With a little C++ code you can make a new userwidget baseclass that allows this, just be careful.
https://wiki.unrealengine.com/UMG_Previewing_custom_UserWidgets_in_realtime