Getting the selected product option in product page API

But you do use the WIX Stores Product Page? If so, you cannot have access to elements of that page, as I am aware of.

As I understood, you want to have access to the DROPDOWN element on the WIX Store Product Page and I think this is impossible.

If you want, you could create a custom product page, then you would have access to the product that was selected. Just like this function that creates the options of the dropdown to select the product:

function createOptionsForDropdown(options, key) {
 const optionsForDropdown = options
 .filter(option => option.inStock)
 .map(option => {
 return {
                label: option[key].toString().toUpperCase(),
                value: option[key].toString().toUpperCase(),
                inStock: option.inStock.toString().toUpperCase()
 }
 })
 return optionsForDropdown
}