@LisaP2 That is exactly what you need to do. This is called a "claim of right" repayment. In order to claim any credit, you will need to compare with your 2019 return. In essence, you prepare an "amended return" to subtract out the SS income that you had to repay. You won't submit the amended return, but you can compare the difference (how much your tax refund increases by subtracting out the repaid SS benefits). And, as you mention, this tax difference is then claimed as a credit on your 2020 return.
This Help Article gives further instructions on how to claim this: What is a claim of right repayment?
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