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This feature is not in all 991.1 models. I have a 2016 991.1 GTS and there is no umbrella holder. It's too bad there isn't, as it is a perfect utilization of that space.
I can’t give you a definitive answer on a 991.2 but I retrofitted the sill from an earlier 2013 Boxster on my 2014 981 Cayman to gain the umbrella holder. I think the 981 sills are the same as the 991.1 sill and probably the same as the 991.2 sill??? I purchased the earlier sill with the umbrella pocket and after removing and comparing it to my existing sill I determined I needed to modify and enlarge the length of the opening in the plastic piece that the umbrella sill snaps into. I used a vibrating universal tool to increase the opening and then the new sill snapped into place. Porsche make 2 different mini umbrellas but the newer one (shown above with the silver handle is smaller and a better fit).
Jim
Plastic piece under sill that I enlarged the opening about 1” on each end to receive the pocket for the umbrella.