You can check out the CY3280-SRM Radial Slider Module Kit or CY8CKIT-044 or CY8CKIT-046, all of which have radial slider modules. We recommend using a Pie shaped pattern as given in CY3280-SRM Radial Slider Module Kit.
The firmware is simple for these patterns. CapSense_GetCentroidPos will return the finger position on the radial slider after CapSense_ProcessAllWidgets(). You can refer a linear slider code example as the firmware is identical.
No PSoC6 dvk have a radial slider on it, only have linear slider.