@goyal_raj Since you filed a Form 8606 with your 2019 return reporting your non-deductible contribution, you probably don't need to file an Amended Return for 2019, although you can do so.
Click this link for info on How to Amend a Prior Year Federal Return.
If you know your current non-deductible IRA basis, TurboTax should generate a Form 8606 for you in 2020 when you report your conversion to a Roth IRA.
Click this link for instructions for triggering Form 8606.
Here's an IRS link for Instructions for Form 8606.
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