Give volume to a drawing

I’m making a book in a 3d environment in Toonboom, I really miss a feature where I can put a little “volume” to the pages so that they don’t completely disappear when showing the side view.

Basically when put a drawing in a 3d environment and rotate the camera 90º tothe side, the drawing “disappears” as it has no thickness like a sheet of paper with 0 mm thickness. I would like to know if there’s a way to give thickness to a drawing on the Z axis

You can not extrude drawings.