You'll need to explicitly inform Vanguard that the amount being moved to the IRA is a repayment of a Coronavirus-Related Distribution (CRD), otherwise they will not be able to code it correctly on your 2021 Form 5498. Contact Vanguard and ask them in what ways you are permitted to transfer the funds to them for this purpose.
This repayment before the due date of your 2020 tax return will be reported on the same 2020 Form 8915-E that reports the original CRD. The IRS has not yet released this form, so it has not yet been implemented in TurboTax. However, the handling will be similar to the handling of various distributions related to disasters such as hurricanes and wildfires in recent years.
