How to Rescan only some graph?

AstarPath.active.Scan() will rescan all graphs during runtime. Is there anyway to rescan on specified graph and not all of them? I have certain situation that need to rescan entire graph during runtime so the update only certain area in a graph won’t work. (The situation is I have multiple sizes units so I need to update diameter on entire graph. This is turn based so the wait time is not so bad.) All my graphs have nothing to do with each other.