Hi mucho ,
Thanks for your post.
Unfortunately, there's no way to export taxonomies in the format you want.
However, you can modify the exported values with custom coding. You can use the 'atum/export/atum_export_entity/export_row' hook to filter one by one all the exported rows and modify their columns. FYI, custom code is out of our support's scope, so I can't help you with that apart from giving you the hook I'd use.
Best Regards,
José Andrés