Counting number of drivers that have led at least one lap

In most NASCAR race summary graphics, there's usually a "Leaders" section next to "Lead changes", which is just a count of how many drivers have led a lap so far. Is it possible to calculate that in ATVO?

I think this would make a good default data bind if it's possible to add.

Thanks for the suggestion, this is now included in version 1.38.3 via the 'leaddriverscount' binding.