Parity for mirror modifier on grease pencil to work well with armature.

I'm trying to animate with the grease pencil character my issue is that I want to reduce the work needed to draw and rig the character and I thought the mirror modifier would be a great work around. As it turns out that the grease pencil mirror modifier does not apply symmetry to the vertex groups making it impossible to rig the same way it takes to rig meshes.