On the zooms with no marked apertures there is a switch between "manual" aperture and auto aperture, which behaves more like a P mode.
On the primes there is no switch but there is the letter A on the aperture ring which does the same thing. I think it's more elegant as you get rid off a switch and still achieve the same results, with the caveat that on many Fuji lenses the aperture ring it's moving too easily and you can end up in A mode.
I would prefer not be be present at all as I never use it, I only shoot aperture priority or full manual.