radialBar with startAngle and endAngle "crop"?

[ion-k12]

I'm new to this library. For the past 10 years, I've been using another library - and am very comfortable with it.

Apex is visually nicer and more modern.

But, I'm having an issue. I'm trying to draw a radialBar chart with a startAngle of -90 and an endAngle of 90. It draws perfectly.

BUT, the whole circle is still "rendered" - even though it's transparent. In other libraries, this type of chart will truncate at the -90/90 point - and not display the whole "circle."

How can I do this with Apex?