viz::Path and viz::Line are only drawn as single pixel line, i.e. do not consider with / lineWidth parameter

I recently added an example usage for viz::Path and viz::Line in to the ArViz example: https://gitlab.com/ArmarX/RobotAPI/-/merge_requests/263.

See an example image for Coin in that MR.

In ArViz Godot, they currently look like this (two left in magenta and lime, the two right ones are cylinders + spheres)

The client sets a width of 10, which should somehow be respected.

In Coin, path and line are 2D OpenGL objects, as far as I know, so they do not scale when zooming. That makes them appear bigger and smaller depending on zoom, so this might not be optimal.

How could we do that in Godot?