Is there a way manually draw a navmesh region?

I’m having a difficult time controlling the way a navmesh is created based on mesh collision types. However, in this case, it would almost be easier to just draw the navmesh regions manually. Is there a way to do this? The desired end goal is to create a region that is qualified for a player to teleport to in VR. Right now i’m using the template approach with a ‘find location near nav mesh’ logic, but i’d rather manually specify the allowable teleport area if that’s an option.