The questions that TurboTax is asking about Roth contributions is about contributions to a Roth *IRA*. Your Roth contributions are to a Roth account in an employer plan, not to a Roth IRA; your employer's plan is not an IRA. Enter amounts shown in box 11 of your W-2 only on TurboTax's W-2 form.
Employer contributions to the plan are not reported anywhere on your tax return.
