Hi there,
I found a similar post here: https://www.keyshot.com/forum/index.php?topic=23088.msg99452#msg99452, but didn't really find a thorough answer.
I tried playing with scattering medium, but the problem is I can't do any directional blur to it to make it look like it's moving.
I've attached an image of how I kind of want it to look.
Is this effect better to be done in photoshop post-rendering?
You probably could do it with scattering medium... just animate the volume you applied the scattering medium to and enable motion blur.