In order to ensure you don't miss any Reporting, you will need to follow the Steps in the Turbo Tax Help Topic "How do I Enter a Backdoor Roth IRA Conversion."
Here is a link the article: Back Door Roth
TurboTax will produce the Form 8606 for you to report the 2019 contribution made in 2020 for your 2019 tax return. This will produce a carry forward basis on Line 14 of the 8606.
You will report the 2020 1099R in a similar fashion, reporting it as a 2019 transaction on the 8606.
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