I am very excited about Grease Pencil, and I want to help out with it. How do I contribute to Grease Pencil? Is there an open issue list somewhere?
Hello Srayan! And welcome
I would suggest to start with the basic developer intro (Developer Intro - Blender Developer Wiki) and then reach out over on https://blender.chat in the #grease-pencil-module channel for further questions.
Since the migration to a new developer platform (https://projects.blender.org) is still ongoing, there isn’t a good way to find grease pencil related issues or tasks yet.