Possible to have custom lighting and custom image effects with HDRP?

Does anyone have any insight or resources on using custom lighting functions in the high definition render pipeline? Despite the infographic on the blog post I haven't been able to figure out how to do something like have stylized toon shading with the HDRP. Furthermore, I've noticed that in the HDRP, normal image effects don't work. Is there a way to adapt them for use in the HDRP or is that not possible? If it is possible, any examples would be appreciated!