How to draw lines with fountain pen effect in Unity?

Question

I'm working on drawing lines in Unity, I've already implemented smooth line drawing with LineRenderer. But I need lines have effect of fountain pen or gel ink pen, just as the picture showed below, I have no idea about this, may shaders make the effect ?can anyone help?

Now I can draw common lines with Unity:

Effect needed:

Answer 1

If you can find areas where the derivative is reasonably high (direction changes quickly) and make this thicker, and then slowly reduce thickness until you reach another, that might work.

No idea how to implements this in unity , but thats’s my General thought.