How to get the Pixel Coordinates of R scale in Radar Chart.

[Udemology]

I know in Bar and Line Chart there is a way to get the (x,y) coordinates with

scales.x.getPixelForValue(index)
scales.y.getPixelForValue(value)

However, in a Radar Chart things are slightly different. With only the R scales how could I extract the coordinates of the Value and Tick in pixels.

For example:
How to get the pixel coordinates of Mon 18?
I do see the ticks in scales.r.ticks[index] but am not able to convert this into a pixel [x, y] value.

Is there a specific command for Radar Chart / Radial scales?