If you are trying to report a 'backdoor' Roth IRA conversion, then you should have a Form 1099-R that was issued by the financial institution when you distributed the funds from the Traditional IRA and put them into the Roth IRA. You should not be entering the information on a Form 1099-R on your own. If the conversion took place in 2020, then you will get a 2020 Form 1099-R to report on the 2020 tax return.
For more detailed guidance for entering the backdoor Roth IRA conversion, please see the following TurboTax article:
How do I enter a backdoor Roth IRA conversion?
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