I assume they are now masks? If not you can copy/paste the strokes from Illustrator to AE and they will paste as masks. Once they are masks, just use the stroke effect. You can animate the start and end point. If you want a stroke that tapers and can be moved in 3D space with some 3D distortion capabilities then you can use Trapcode’s “3d stroke”. trapcode.com
Chris Smith
https://www.sugarfilmproduction.com