Seeking ONLY Wix Developer (NOT WEBSITE DESIGNER) Expert in Customizing / Coding Product Page and Add-to-Cart

For an online store that is being created, need some important steps to be added: On the Product Page, AFTER the customer/user has selected the “Main” product, the user MUST select other options (NOT Variants) for that product to be “complete”. Each option’s price must be displayed for user to see and then added (calculated) to the cart, as per the user’s selection (the Variant’s option is Wix is not a solution in this case). Please note: these options or add-ons should be calculated in the cart along with the Main product chosen when customer is ready to check-out. All prices for features/ options are to be displayed and calculated on the product page for user to see.