Yes, if you previously converted or recharacterized non-deductible IRA contributions to a Roth account, this would be prior Roth contributions, which would be tracking for you via Form 8606 each year you made a conversion or recharacterization.
You will be asked of you had and tracked non-deductible contributions - say yes. The enter the amount from the last filed 8606 form line 14 if it did not transfer. Then enter the total value of any Traditional, SEP and SIMPLE IRA accounts that existed on December 31, 2020.
A conversion to a Roth IRA results in taxation of any untaxed amounts from the traditional IRA. The conversion will be reported on Form 8606, Nondeductible IRAs, for the year of the conversion.
Click this link for more info on Conversion and Recharacterization.
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