You can add custom fields to the plugin as long as they are stored in the wp_postmeta table. Follow the instructions from our guide here:
https://www.pimwick.com/pw-faq/custom-fields/
WordPress.org doesn’t allow supporting Pro plugins using their forums so I am marking this thread as resolved. If you have further questions please contact us at our website: https://www.pimwick.com
Thanks for understanding!