Hi Ivan,
There probably wont be a way to do it on a "Surface". but there is a command written that will do it on "curves". (Attached zip. I don't remember who wrote it for credit. It wasn't me.)




So you could use this with extracting isocurves and running a curvature analysis on them.

There is an original one that doesn't add the "points" to the result, if you want that one instead.