Hand Painted normal map support

Hello there . So i was testing making custom normal maps for 2d sprite sheets. I know you can "use lights on" grease pencil layers But you can't make custom lighting areas like this.

files.catbox.moe/d9ufzr.mp4

So a propose that there could be a way to add a normal map "texture" to a fill material . (Adding one to it right now in the shader editor does nothing)

Or a Way to mark a layer as a "normal map layer."

Also a way to export the normal maps from the render. For animations. The reason you need this is for sprites in game engines.