Sorry for the late response. You are right that EnergyPlus has an object for F-Factors and we’ve had an open issue to eventually support them in honeybee:
But it hasn’t been prioritized since F-Factors are kinda a simplification of what we currently do for ground constructions and changing your model to use F-factors isn’t likely to change the energy use much if you’re using a ground construction with an R-value that’s aligned with your F-factor.
If you badly needed R-factors now, you can write a Python component that post-processes the honeybee-generated OSM using the OpenStudio SDK like what you see here. But we’ll get to this eventually and you can probably just use an appropriate R-value for now without worrying about the energy results changing much.