Please clarify whether Chargebee supports custom hybrid plans (e.g., Per Seat + Usage models in Stripe terminology, which, correspondingly, would approximately be equal to a combination of Per Unit + Volume + Tiered models [1]). If Yes, please create or point to relevant documentation; if No, do you have plans for implementing such capability?

[1] https://www.chargebee.com/docs/plans.html#pricing-attributes