For the general purpose of reporting Roth IRA distributions there is no need to tell TurboTax your basis since these distributions are qualified distributions that are not reportable on Form 8606, the only place on your tax return the basis information would otherwise be needed. Since the information is not presently used for preparing your tax return, it doesn't matter what Roth IRA basis values you enter if TurboTax asks for them. You could enter zero or leave the entry blank.
The only reason you might want to continue tracking basis in Roth IRA contributions and conversions is if your Roth IRAs lose value and after 2025 when miscellaneous deductible subject to the 2% floor are scheduled to be reinstated and you could take a deduction for unrecoverable basis if you completely drain your Roth IRAs. That's probably unlikely.
