There will not be a place in TurboTax for this situation. I would suggest just entering it under IRA and keep records of what you did in case it is questioned. You will have to pay with the entry to be sure you get the right outcome.
For example answer No to having a plan at work, even though this could be a work plan. Someone else will probably have a better solution for this. You want to take advantage of the tax break for making these contributions. Entering as Traditional IRA is my best thought for this.
