How do you draw an ellipse that has thick and thin lines?
I currently use Affinity Designer and I can achieve this simply by varying the pressure on the live using a Pressure tool.
if it's just one instance, two ellipses could do the trick. Convert to curves (Ctrl+Q), duplicate (press + on the numeric keypad) and move the upper node.
Its unlikely to be one instance as I would be doing a technical illustrations with many ellipses. I've yet to check out Corel Draw as suitable software for doing technical illustrations.