Offset curve bevel extrusion Learning Blender. Can anyone tell me is there a way how to offset this piece.

What I have here is path which is set on bevel extrusion with start and end values changed with circle curve as a sweep object. Now I would like to know how to offset this piece along the path. Analog to this would be probably After Effects Trim Path.
When you hover over the Bevel Start and End Properties you can press I to create a keyframe on them. The keyframes can be offset (move G) and duplicated in the graph editor.



You could continuously Duplicate and Move the keyframes for both of the start and end values, or animate them independently.