Repayment of sign in bonus and relocation

So, i received sign-in and relocation bonuses in 2023, reported them on my tax return, worked until December 31, and then in January 2024, my employer asked for the return of these bonuses. They haven't provided any documentation and suggested resolving it through a third party. Since the bonuses were returned, i am wondering where on the 1040 form i can claim a refund for the taxes paid on these bonuses.