This question is egarding an article in a past publication in a journal or conference proceedings with two or more authors.

If subsequently, i.e., in the post publication period any of the authors desires to mention/record their respective individual contributions or part attributions, how may that be done?

Are there procedures by publishers to record comments by previous authors through any post publication consent form about authorship claims and copyrights?

Or is it better to write a separate new paper maybe including new updated exclusive individual researches?