This system takes advantage of the NavLinkProxy objects in Unreal Engine allowing AI to navigate through unnavigable areas. Two Blueprints were made for this system: BP_JumpNavLink and BP_Archway.
This is a NavLinkProxy Blueprint that will allow AI to jump from one surface to a higher surface. This can also be used to allow AI to drop from a higher surface to a lower one.
The area under SM_Arch is too narrow for AI navigation, so I made BP_Archway to fix this. This Blueprint has a NavLink component to allow the AI to walk from one side of the archway to the other.