There is an extension.
Properties .cover .onTop
To be able to create 2D surfaces I used the cover in a simple way.
This is done by the new .cover property.
From the cylinder you get a rectangular surface comparable to the three.js PlaneGeometry.
With torsion, you can then create something like this. Added in the example.
About the new property .onTop.
Originally, the geometry was such that it normally stood on the xz plane. This resulted from the origin of geometry to create a figure with skeleton and bones. Pino - a procedurally generated and moved skeleton figure
However, for other applications, the standard of three.js with the center in the origin is more suitable. It is now available via dafault. To not change the appearance of the example I added onTop: true, to the properties.