When you repay unemployment benefits in the year after you received them, you may be eligible for a deduction or credit on your taxes for the current year (in this case, your 2021 taxes).
When you are preparing your taxes next year with TurboTax, in the Wages and Income section start the process of reporting Unemployment Income, but indicate that you didn't receive any benefits on a 1099-G or otherwise (unless you did, of course!). You will also be asked if you repaid any benefits from a prior year. When you enter them, TurboTax will calculate the credit or deduction for you!