hi! Someone can be package me? Is there a possibility to insert additional fields in the header of the material when the material goes through new materials from the user/category. I know that the pin is configured in template/default/latest.php

Hello,

Unfortunately extrafields are only available for items at the moment.
In order to add data to different elements, you need a K2 plugin.

I understood correctly that this requires a plugin?

Yes, to add additional data apart from the item where you can use extrafields, you need a K2 plugin.