Hello Steven and welcome to the forum.
I suppose you already realized that this is not a conventional way to show a part on a drawing so there are a couple of ways to make this work.
1st of all, you can sketch this with drawing curves. Since this is relatively simple, and if you don't care about associativity, this might be sufficient. I find myself doing several drafting overlays on drawings for various reasons.
You could also use a family table option back in the model. You can make a family table instance without those 1/2" rounds. You then -add- the additional model instance to the drawing and create a view with that instance. This will create a view that will remain associative to the real model.
Of course, I am assuming you are creating the rounds as a separate feature that can be suppressed to get the results you want.