Custom Text Fields in Dynamic product page that can be added to cart?

Question:
I am trying to find the code that will allow me to create more then 2 custom text fields in my wix studio custom product page. The text fields will collect information and then that information can be added to cart.

Product:
WIX STUDIO

What are you trying to achieve:

I am making a custom product page where the user can input lines of text in 4 separate text boxes for their product option. Once they have inputed into at least 1 of 4, that line of text can be added to cart and seen in the check out page.