Considering all the ones I've seen have the max persons/weight rating sticker mounted to the front side of that seat, I'm 99% sure it's non-removable and apart of the top shell mold. The lower section on the backside under the seat is removable, so you could possibly modify it so that the back rest portion becomes and oversized armrest, but I'd imagine trying to cut it out would not be the best idea structurally.
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