Trial Period payment form value sent to PayPal

I'm trying to configure a form to submit a payment for a monthly subscription service. The issue is, I need to be able to add a "set up fee" to the initial transaction, followed by monthly payments. The initial fee is equal to the monthly payment plus the set up fee.

Paypal has a "Trial Period" for subscription based payments, which can be different values than the set monthly payment.

Is there a way to pass a "Trial Period" value to PayPal within the Payment form created in ZC?

Thanks,