/usr/share/zsh/functions/Completion/Unix/_j is in autojump 21.6.9-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | #compdef j
cur=${words[2, -1]}
autojump --complete ${=cur[*]} | while read i; do
compadd -U "$i";
done
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