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Version: 1.21+
Choose a safe location in your survival world away from existing villages (so the farm's villagers and golems don't interact with other villagers). Make a 3x3x3 hole.
On one of the sides break 2 blocks and make a hole 2 block deep, place Soul Sand and water on top.
On that side, cover the main pit with 3 blocks and place trapdoors under them.
Place 3 beds facing the water pit.
Using a boat (or any other type of transport) take 3 villagers inside the pit and over the beds, cover them with trapdoors.
Place a double-chest with connected hoppers in one of the main pit corners.
Close the trapdoor's pit making a 4x5 rectangle with walls.
Make path blocks (right-clicking with a shovel) in a 7-radius block, making a 19x19 area, with the pit in the middle.
Place water in the opposite side of the hopper corner (place a temporal block, water on top, then destroy the temporal block), on the hopper corner, destroy the outer dirt block so, when placing lava on top of the wall, flows into the empty space.
Name the name tag, lure a zombie into the watered-soulsand, name it so it doesnt despawn.