You will want to file the Form 8606 for 2021- and you are correct that you can send it separately to the address on the form instead of a full amendment. You can use TurboTax to amend the 2021 to create the 8606 then print and mail the 8606 only (follow the same steps for this year's entry). The directions for entering the 2022 Backdoor: How do I enter a backdoor Roth IRA conversion?
If you need help while you are in TurboTax, add to this thread or start a new one- there are lots of experienced TurboTax users that can help with specific questions.
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