Unfortunately, IRS would have to create a special payment voucher for this purpose and then TurboTax could put it in place.
TurboTax cannot create forms and payment vouchers without IRS consent and if IRS were to consent, it would be available for all taxpayers.
MGRAINGER provided the answer above:
"you can find the amount of self employment tax deferred on SCH 3, Line 12e. You are required to pay 50% by 12/31/21 and the other half by 12/31/22. You can pay online at irs.gov/payments."
