I am not sure why you mention FICA and Medicare tax, as that would not be paid in on a personal tax return. Whatever FICA or Medicare tax withheld would not be adjusted by filing a personal tax return unless your income exceeded the FICA wage limit because you had income from more that one employer. In that case you could get a refund on your personal tax return for the excess FICA tax.
You will need to mail in your tax return if you want to attach a statement like you suggest.
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