Yes, you will list the basis as $6,000 when TurboTax asks about "Any nondeductible Contributions to your IRA?" in 2019 and prior years. If you did not file a 8606 with your 2019 return then you will have to amend the return to include it. Please see How do I amend a 2019 return in TurboTax?
[Edited 2/16/2021 | 7:25am PST]
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