If you completed the 5-year qualification period in the Roth 401(k) before rolling the funds over to the Roth IRA in 2020 or later, all of the money rolled over to the Roth IRA became part of your contribution basis in your Roth IRAs.
However, you do not need to provide TurboTax with this information because your distributions from your Roth IRAs are qualified distributions, so no calculation is required on Form 8606 Part III to determine the taxable amount. Qualified Roth IRA distributions are not reportable on Form 8606.
