What you are showing is the result of the surface LIC rendering. Since the LIC representation is computed at render time the only way to export the result is indeed to do a screenshot, image writers will not be able to help you there.
I think the way to go would be to use the Python Shell to :
- Get the screenspace bounding box of the representation of your plane (I don’t know how to do it)
- Make the camera zoom to this screenspace box (it is possible using the
Zoom to Boxfeature interactively, but I don’t know if it’s possible in Python).
TLDR I’m not sure it is possible to do it. Maybe @mwestphal have an idea.