@macuser_22 is correct. Rollover from the traditional 401(k) account in one employer's plan directly to the designated Roth account in a different employer's plan is not permitted. The new employer's plan should not have permitted this.
What should have happened is a rollover from the traditional account in the old employer's plan to the traditional account in the new employer's plan, reported on a code G Form 1099-R with $0 in box 2a, then an In-plan Roth Rollover in the new employer's plan, reported with a separate code G Form 1099-R with the taxable amount in box 2a (in this case, apparently the entire box 1 amount).
Each of these Forms 1099-R would then be entered into TurboTax. For the second, taxable one you would indicate that the rollover was to a Roth 401(k) account.
If the distribution from the traditional account in the old employer's plan was truly deposited directly into the Roth account in the new employer's plan, it seems that this would be a failed rollover that would need to be removed from the Roth account as an excess contribution, the original distribution from the the traditional account in the old employer's plan rolled over to the traditional account in the new employers plan under IRS Rev. Proc. 2016-47 self-certifying that the late rollover to the traditional account would qualify for a waiver of the 60-day rollover deadline (which applies because failure of the original rollover causes it to cease to be a direct rollover), and then perform an In-plan Roth Rollover (which, if done in 2021, would be taxable on your 2021 tax return).
There is no such thing as a recharacterization involving a 401(k). There is no such thing as a nondeductible contribution to a 401(k). Those terms apply to IRAs, not to 401(k)s.
