Laravel Spark charge for usage on top of subscription

I have a Laravel Spark application in which I'm charging teams a subscription based on the amount of team members.

For argument's sake, let's say with this subscription, each team is given the ability to use 100 messages per month, however I also want teams to be able to use more messages each month for an additional cost on top of their membership.

Is there a way that this can be implemented into Spark? If not, what is the recommended method for doing this within Cashier?