Over the years I have had 4 Ex Jazz cars and none of them have had an adjustable height passenger seat.
I joined the Jazz scene, having driven Landrover vehicles of various sorts for many years, so for me, even the drivers seat, with full height adjustment, seemed too low.
My solution was to make up a set of spacers, with longer fixing bolts, to raise the seat still further.
So, my seat is 25mm higher than normal at the back and 20mm at the front, which for me is much more comfortable.
When I trade in the car, the spacers are removed and transferred to the next car.