@Rajkyel1 , Please answers above -- there is NO requirement , nor any space for, to provide your citizenship details on form 1040. This rumor about the the requirement is FALSE, Has been answered above as such.
If you are claiming Tax Treaty benefits , then YES, IRS would need to confirm your citizenship -- this is done on forms like 8833 / 8831/8843 etc. Nothing to do directly with form 1040.
