Rounded bottom straight trough in Easel

Trying to create a rounded bottom straight trough - that will hold poker chips set on their sides. I have tried super gradient app, but only want the two opposite sides to have the gradient / rounded effect (not all 4 sides). The two end sides will be squared off/flat.

Can this be done in Easel?

Actually figured it out using the Bezier Slope Generator and combining two curves together worked.