Minecraft wiki entry for BE, associated text: Block entity data
Tags common to all block entities[show]
 final_state: The block that this jigsaw block becomes.
 joint: The joint option value, either "rollable" or "aligned".
 name: The jigsaw block's name. This jigsaw block will be aligned with another structure's jigsaw block which has this value in the target tag.
 pool: The jigsaw block's target pool to select a structure from.
 target: The jigsaw block's target name. This jigsaw block will be aligned with another structure's jigsaw block which has this value in the name tag.