There is no nice way to achieve this I'm afraid, but if your output is 2D you can collapse the 3D figure to 2D and then manipulate the leader lines and add some new ones to get the result you have in your example.
As far as being able to do this in the 3D figures I would suggest putting this in the ideas section for others to vote on in the community and gauge whether or not this is a feature that others see as valuable.
You can submit it to the Creo Ideas site:
We monitor this site for ideas related to Creo Illustrate.
Thanks for your feedback!