Welcome to the Event, don321!
You have definitely done your research!
TurboTax does not do calculations for you, however, here is a good site to use for that purpose:
How to Calculate the Present and Future Value of Annuities
403(b) choices are limited to annuities and mutual funds - so your annuity would be considered part of your
403(b) plan.
The IRS does go into more detail here: 403(b) Retirement Plans
