Unfortantely not, Vermintide 2 is a PS4-only game, and PS5 is treated as a PS4 Pro aswell as unlocking stable 60fps. Sadly, we are stuck with the same amount of RAM.
My understanding of where we’re at with this currently, is that it will continuously be being worked on and improved, and that over time our Console Developers will optimise and hopefully find enough memory to solve this issue.