Think if they do it should be inspired by korean asian burial areas or like cyberpunk 2077 ones, where its a urn in a section of memorial section or something like that. Think grave stones are going to become too much of a issue and pile up too quickly with so many sims potentially eventually going there, remember personally trying to do sorta like a cemetery in new crest myself was supposed if you wanted pathing and some decorations that space even for 50x40 lot I think that one is fills up really quickly.
So think they need to do more minimalist version with either urn displays or with just a flat plot plate on the ground for the place to actually be able to hand potential volume of sims that maybe placed down there.