Does WPSmartPay support quantity-based pricing?

I need a checkout where customers can purchase the same product for 1–5 websites. For example, $49 for 1 website, $98 for 2, up to $245 for 5. Ideally, the customer selects a quantity and WPSmartPay automatically multiplies the price.

I see normal form fields and Pricing Options, but not a Quantity field tied to the transaction amount.

I also need this for subscriptions. At $7.99/month per website, selecting 3 should create a $23.97/month subscription and retain that quantity for renewals.

Is there a native way to do this? If so, is quantity available in the payment/order data for integrations? If not, is the recommended approach to create separate Pricing Options for 1, 2, 3, 4, and 5 websites?