I’m having the same dilemma. I just attempted to make a workflow to increment the number of calls made on a given contact, however, per this article, it appears: “activities and activity properties cannot be used for re-enrollment in any type of workflow.”
With this said, I’m not even sure how one could do a workaround on this.
It’s a bit ridiculous this isn’t already baked into the platform - along with a complementary property of ‘Number of sales emails’.