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F-Factors are tricky because there is no referenced definition or methodology that others can use to generate them. I am considering putting together an ASHRAE Research Topic Acceptance Request (RTAR) to better define the ASHRAE 90.1 requirements for foundation insulation.
In the meantime, it might be possible to generate F-Factors using Kiva. You would have to simulate your foundation and fitting a line using the following equation:
F=˙QP⋅(Ti−Tg)
where
Short of doing some kind of numerical calculation, it is not possible to generate new F-Factors.
Disclosure: I develop Kiva