I rounded the edge of a contact wheel once and did not like the results.
As others have said, track the belt off about 1/8". Sometimes this will give you the nice radius you're after automatically - sometimes it won't. If it doesn't, sculpt the radius in by pulling the knife away from the wheel as you back into the ricasso area. Depending on how steady my hands are that day, I may or may not support my hand - not the blade - on the tool rest. I drop the rest way below the wheel for this.
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