I'll try to create a macro, but for now you can Edit the sketch, Select Two lines, Click Add Point. A point will be generated at the virtual intersection of the two lines.
I'd like to do it with a 3D sketch seperate from the driving one.
Currently when I open a new 3D sketch and place a point, it snaps to the apex of the U bend.
However I can't find any function to get the curve apex, only its start and end points.