Get fields from “Extra product options” in Export

Hi,

I am using this export plugin and the plugin “Extra Product Options by themecomplete”, but I do not know how the custom fields from EPO can be added to the export. I do not find my individual fields in the dropdowns at “add field” neither at “Products” nor “Product Order Items”. Is there a way to find out how the fields are named and to import them in the report? Or is this only possible with globally added product options?

Thanks for your help!
Benjamin