Another notable observation by Big Bun CG on Weibo is the long strip struçture located at the top of the right side of the hangar deck celling (bracketed in yellow) on Fujian in the photo below. That structure is very likely to be a dry goods supply gantry.
This is similar to how the USN typically conducts underway replenishment of dry goods for their CVNs, where the onboard gantry will be folded up when operating the deck elevator, and be folded down when in use for underway replenishment. With transfer cables and winches attached and connecting said gantry and that on the fast combat support ship, dry goods can be transferred directly into the hangar deck, which enables easier sorting and distribution of dry goods replenishment across the carrier.
This is an important capability step-up from Liaoning and Shandong, where the dry goods resupply gantry is located outside the hangar deck. This means that the rear deck elevator must be in the lowered position to allow the dry goods that have arrived onboard the carrier to be moved into the hangar deck for sorting and distribution.
One additional benefit to having similar dry goods supply gantry setup as those onboard the US CVNs is that the deck elevator can be in the up position, which adds additional aircraft/helicopter parking space onto the flight deck which is otherwise not available on the PLAN STOBAR twins.