Custom navmesh

Is it possible to make a custom navigation area that can follow splines like in assassins creed or where you can customize the geometry of the navarea in the editor? I plan on making a climbing system but my AI needs to make use of it and I was following this video Submerged Developer Diary #2: Climbing System in Unreal Engine 4 - YouTube. I planned on using navareas so the player won’t run off ledges and also it would be much easier for AI. I also planned on using the navlinks as the transition points as said in the video.