Add javascript or jQuery script to Chronoforms V5 form

We're developing a form in Chronoforms V5 where we charge a fee based on how many devices the customer is registering, and they have to enter a serial number for each device. Once the form is filled out, it's sent to PayPal or [login to view URL] for payment. I currently have it set up using the multiplier feature in CF5: 1. They enter the quantity of devices to be registered, which calculates the total price. 2. They click the "add" button to repeat the required serial number input fields. There is currently no connection (validation or calculation) between the quantity they input that generates the total amount, and the number of serial number input fields they create. So it's possible they pay for 4 devices, but fill in 6 serial number fields. We need someone to create a script that will count the number of repeated serial number text fields, and input that number into the Quantity field (the quantity field would be a read only field). The Quantity and Total Price fields would be updated as new serial number fields are added or deleted. The script we have currently that calculates the Total Price would need to be edited or replaced to work with the new script. I will send a URL to our current form in a private message.