StructureBlockEntity
Mode of structure block; 0 means load, 1 data (consumed by pools), 2 save.
Metadata to be passed when is set to data mode.
Load or save NBT data of entities contained in bounds, existing data will be omitted.
Load or save NBT data of players contained in bounds.
Lower values destructs more random selected blocks.
Powered by redstone signal?
0 means no mirroring, 1 mirror above x, 2 mirror above y, 3 mirror above z
0 means save signal power (lit lamps, redstone itself, etc.), 1 forget (unlit sources will be updated when structure is placed).
Blocks will be merged (with structure air as real air) or pasted as-is.
0 means no rotation, 1 90 degress, 2 180 degress, 3 270 degress.
Seed to be passed when configuring
Display bounds of structure in-world, includes vertex frame above.
Vanilla or behavior pack namespaced (first directory determines namespace, subfolders joined with .) relative path to structure, try something like "minecraft:endcity.ship".
Block Entity will be saved without instantiating new one when transporting (via pistons, commands, etc.).