Customize Wordpress Event Manager Plugin

General information for the website: We are using the EVENTS CALENDAR PRO Plugin + Woocommerce
Kind of development: Customization of existing website
Num. of web pages/modules: 1
Description of every page/module: We are using the EVENTS CALENDAR PRO + TICKET PLUS PLUGIN from https://theeventscalendar.com/product/wordpress-events-calendar-pro/ to sell tickets for small events.

The Plugin has the possibility to add some additional features via checkboxes or dropdown (e.g. like on the screenshot: "Abendessen" ) but without additional prices which should be added to the woocommerce price.
Description of requirements/features: The task is to add a pricefield in the backend for this checkboxes, which will be added to the final woocommerce price. (e.g. on the screenshot: +5€ for dinner adds to the 30€ ticket price = 35 €)
Extra notes: Important! Please provide the time you need and the final fixed price for this task.