Getting the portion withheld for taxes back into the plan requires coming up with the funds and rolling them over back into the plan. Had this been done within 60 days of the distribution, this would be easy. However, the only way to get the funds back into the account now that the 60-day deadline has passed would be by getting the plan to accept self-certification under IRS Rev. Proc. 2020-46 (reason 3.02(a), financial institution error, would seem to apply) that these circumstances would qualify for a waiver of the 60-day rollover deadline to allow the rollover to the Roth IRA of the original amount distributed from the designated Roth account in the employer plan: https://www.irs.gov/pub/irs-drop/rp-20-46.pdf
Once a rollover has been accomplished, you'll report the distribution as having been rolled over, no change to the Form 1099-R that you received.
