Thank you very much!
You question should be more “How to get my widget object to access valuables”, because once you got object you can access any public and blueprint exposed part of it
“Create Widget” that you use to spawn your widget outputs you widget object, you can place it to variable (with your widget blueprint type, so you wont need to cast more then once), and then from that variable you can access variables inside widget, by dragging and dropping link from variable that contains your widget.
There also “Get Active Widget” node but i don’t know to get Widget Switcher needed to use it 