No, but they should. I think you said that earlier. Laika provided a very basic beginning of what you’d need to do to make one, although that would really only tell you how much better than league average a guy is from one year to the next at stealing total bases, it wouldn’t take success rate into account or provide any insight into the run values associated
In fact, the more I think about it, SB+ really isn’t all that important in the grand scheme of things