Candidate selection workflow how to add rejection reason under additional information?

Summary

Candidate selection workflow how to add rejection reason under additional information?

Content

Hello,

We would like please to add reason to the rejection reason in the section of 'Candidate selection workflow' - when performing the
'change/update status' for the candidate and choosing 'Reject' ,under the 'additional information' we would like to ADD a new rejection reason.
is it possible and how ?

see screenshots attached,
Thanks
Revital.