Yes, they have, but in an unusual range (keep in mind, this is for every instanced segment): three.js/examples/jsm/lines/LineSegmentsGeometry.js at 534737d242a82239d7e89457ba6005810a361153 · mrdoob/three.js · GitHub
I had to modify line’s material to have UV coords (maybe not what exactly you’re looking for, but as an example): Generative (Fat Lines + texture + Selective Bloom)