Percentage Based Billing with Stripe Billing

Hi there, hope this finds you well

I just wanted to find out if there is a way to charge customers a percentage of their overall processed transactions from their own customers in a given month for example: they process a 100 000 of customer payments and I take 1 percent of that (100 000 - 1%) or charging a percentage on a per transaction of their customers for example (customer1 800-1%) (customer2 700-1% etc…)? Or would I have to do this in a custom way? Not seeing this in the documentation or maybe I’m missing this?

I want to use Stripe Billing for this and not Stripe Connect