None
Sophy can only drive cars it's been trained on
and it doesn't know how (or when) to pit.
Custom Race has options like: mechanical damage, tyre wear, fuel usage, off track grip reduction, tyre restrictions, custom weather conditions, one-make car selection, garage car selection.
Sophy is not trained to work with any of these settings.
Maybe later they'll add Sophy as an option in Custom Race, but it would still grey out a lot of options where it hasn't been trained on those settings.
I can guarantee that you will never be able to use garage car selection with Sophy AI without a massive significant rework to how it works, as Sophy cannot understand how to drive custom tuned cars.
I would also assume it doesn't know how to use Nitrous (or Overtake), but I'm not 100% on that. Nothing I've seen suggests it can and it would lead to an extra output value, which is not as trivial as it sounds.