You can right click on content drawer > user interface > widget blueprint.
You can create a 2D image yourself that resembles the picked item and insert it in the widget, but if you want your 3D mesh to be a displayed, here’s a video I found that explains how: https://www.youtube.com/watch?v=ndK_2XDDMXg
In this video, the purpose of the widget is different than your goal, but you can simply fix that at the corner of the screen which is even easier!