Create a story for the PolarGrid, which has controls for adapting the style of the grid lines.
Controls: stroke, stroke-dasharray, stroke-width, (and maybe more?)

The properties stroke, stroke-dasharray, stroke-width, etc. are not documented on the PolarGrid.
(Unfortunately they are not documented in many places 😓 )

https://twitter.com/pomodorozhong/status/1628129110504656899