How does the angry_at piglin nbt work?
You can use this command:
/execute as @e[type=piglin] run data modify entity @s Brain.memories.minecraft:angry_at.value set from entity LittlePythoner UUID
You can use this command:
/execute as @e[type=piglin] run data modify entity @s Brain.memories.minecraft:angry_at.value set from entity LittlePythoner UUID