Don't think you can. You would have to ask the IRS. Seems strange you got paid interest on it but not the refund. Although there is a place to apply an overpayment but that might just be for the prior year 2019. So unless the IRS told you to enter it on your tax return I wouldn't chance it. And since they sent you the interest in 2021 maybe it gets applied to your 2021 return too.
