Make a arc display like a richline

A richline can be defined so that you can change the RLine scale and the width of the line widens to that setting. Is there any way that I can set a line and an arc to also widen to display the wdith in LineScale?

Also, lines go from lineweight 0 - 2.11. Is there a way to define custom lineweight sets that go wider than 2.11?