Can a team be billed based on number of non-user models related to it?

I'm curious if Spark allows you to bill a team not for the number of users on that team, but the number of animals (for example) related to that team?

In this scenario, a team can have any number of users but will be billed on how many animals belong to that team. Each available Stripe plan for a team would be billed at a different price on a per animal basis.

Thanks!