Transferring in is not an option. After initiating an amendment using 2021 TurboTax, you'll need to go to Wages & Income -> Retirement Plans and Social Security -> IRA, 401(k), Pension Plan Withdrawals (1099-R), indicate that you took a disaster distribution, that you received a 2020 disaster distribution and then fill in the information that you obtain from your 2020 Form 8915-E. You'll then transfer the amended 2021 Tax file into 2022 TurboTax to begin your 2022 tax return.
I suggest that you do not try to amend without using 2021 TurboTax to prepare the amendment. Amending without using 2021 TurboTax could very easily result in you missing some other required change that is caused by the change in your AGI. You also wouldn't have an accurate 2021 tax file to transfer into 2022 TurboTax.
