I also measure meetings (counts, lengths, and mostly meeting minutes/outine jotted down by myself) and keep track of other metrics, exactly for this reason. However, I also don't happen to have written best selling books and stuff, so I really must do this, and you really shouldn't have to :-)
EDIT: another commenter mentioned that their platform is used by other companies (VW perhaps?). With that information, it might make more sense to do this.