Bedrock Editor on Java
BUT
In Survival, instead of instantly generated, it's built to done as a task from Personal Iron Golems with a 'Customized Jack'o"Lantern' item, that starts as a mini Halloween update of being able to carve your own pumpkins, only on Minecraft Live for the trailer to have one player then take the Lantern and put it into a golem recipe and the thing is now a Personal Iron Golem to command.
Like what that Minecraft did with the Blue Golem, like how they did Happy Ghasts and leashs and boats to do the Piglins on the Ghast but for you. Now you can make golems that build projects for you, if they're uploaded from the editor. Iron Golems will place blocks for you, slowly but surely, and build your creations over time, or up to the materials you have and so they can reach the new y-height to keep building on the project, so if you're missing a layer of granite they can't place all the diorite they have. So it can be like Lego following the instructions, but you still have to go farm the pieces and wait the time. You can also finish parts of the build while they're working on it, and they'll register it as the correct block.
Or you can set them to dig out tunnels for you to a certain horizontal distance, building the walls and pillars holding it. Just build an inverse sculpture of some length and the Golems carve it out for you. Further upgrades could make them hold certain materials they find, since otherwise they just dig past it and let it spawn out with the cobblestone and dirt.
Also assumedly the Customized Jack'o'Lantern that registers YOU as the sole owner of the Copper Golem, and otherwise, taking from the chest when you're not the owner or on a whitelist will cause the golem to attack them. Personal Snowmen too I guess. Abominable Snowman moon shot, you put a Snowman on Sculk with an isolated shrieker of 3x3 width, you add the jack-o-lantern, it ritually summons a warden snowmany hybrid called the Abominable Snowman that- toolongnvm
