Not yet.
Unfortunately I never got the bandwidth to dedicate my full attention to this part. But yes, I do want to implement this feature somewhen soon, using that library and improve upon it.
In the past I've worked on mapping software for networks, in one of them I also implemented tools like distance calculation, area calculation, elevation profiles, things like that.
I want to build these features into netjsongraph.js and use these in OpenWISP. That's my idea.
But since you'll be needing this soon I believe, you'd better start however you feel comfortable in doing and once you have anything to share you can send the link here so me and others can take a look at it.
Thanks!