Change the appearance/visual of a scrollbox

I’ve been playing with scrollbox but even if you have some options like barStyle, I still cannot find a way to change their visual/appearance in a good way.
When I tried to change the vertical background image for instance, the image is always completely deformed. If I want to change the “thumb” image, for example to have a simple square, same stuff; the more you can scroll, the more distorded it will get.

Like, is there any way to do that kind of oldschool scrollbar in UE5, with a “top slot image” and a “bottom slot image” marked as arrow, and a “thumb” as a simple square?