bit of a workaround, but you could put an ellipse on the top of a triangle.
i don't think gem has either geometries built in, but you can make a triangle with the [polygon] object, and then make an ellipse by making a circle, and then using the [scale] object to squash it down a bit. this would work for sections of less than a quarter circle. for greater amounts, you would have to add more triangle/ellipse sections.
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