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Unfortunately, you cannot have two payment integrations in the same form and you would need to integrate a second form if you would like your users to send you money and not pay via the PayPal checkout page.
This guide will help you to set up a multiple payments form: https://www.jotform.com/help/182-How-to-Create-a-Basic-Multiple-Payment-form
This guide will also help you: https://www.jotform.com/help/161-How-to-Update-the-Multiple-Payment-Form
This payment app may help you to achieve what you want: https://apps.jotform.com/app/purchase_order_app
PayPal only seems to allow users to pay using a PayPal account or with a Credit Card; however, I think if you have the amount that should be paid you may ask your submitter which payment method they want to use and if they do not want to pay using PayPal you may provide the instructions to send you the money instead.