Performance document : is it possible to add custom field in the last step of Performance document?

Summary:

Is it possible to add custom field in the last step of Performance document?

Content (please ensure you mask any confidential information):

Hi,

we would like to insert into the last step of Perfomance document a custom field that can be edited by the employee evaluated.

We want to insert the custom field into the "Contenuti" section.

Thanks

Regards, Francesca