The only reason to enter your Roth IRA contribution and conversion basis (including the basis you inherited from your husband) is in case you fully distribute all of your Roth IRAs after the year 2025 and you have unrecoverable basis. In that case, you'll be able to claim a miscellaneous deduction subject to the 2%-of-AGI floor on your 2026 or later tax return when this deduction is no longer suspended under the Tax Cuts and Jobs Act of 2017, otherwise TurboTax does not need this information since your Roth IRA distributions are qualified distributions that not reportable on Form 8606.
