We now offer price add-ons for Virtual Options in our Advanced Plan. Make sure that you have upgraded to the Advanced Plan in order to see these options in the app.
After you have created some values for a virtual option you will see the price add-ons below.
These options by default will show as price add-ons above the add to cart button.
You can also add these price add-ons to the main price by going to the Settings > Add price Add-ons to Main Price.