Stationary Textures on grease pencil fills

I thought this might be a bug but Maybe it's more of a feature request.

I wish the textures you add to fill materials would stay stationary.
The fill has a texture applied and is rigged to a bone.

I animated the bone and a animated the Grease pencil object directly. Since the texture seems to be projected from one random spot , the Bone animation will make the texture move all around. But transforming the whole Object makes the texture stay stationary. i think it should also be doing the same with the bone.

This would allow Gp Rigging work flows that mix Gp with hand painting. Soft shading and more painterly styles. Gp being the core geometry and then the texture being the color information

Here's a video example.

files.catbox.moe/08wba1.mp4