How to make a custom brush with calligraphy effect for Apple Pencil

I am trying to develop an app that enables calligraphers to use their Apple Pencil as a calligraphy pen.

The problem I am facing is that I don't know how to customize the strokes drawn by the Apple Pencil using the PencilKit framework.

I also tried to use UIKit and handle the touches by Apple Pencil, but I am not sure how to achieve the desired effect.

Can anyone guide me to solve this issue?