/usr/share/zsh/vendor-completions/_sd_outputmodes is in systemd 237-3ubuntu10.
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 | #autoload
# SPDX-License-Identifier: LGPL-2.1+
local -a _output_opts
_output_opts=(short short-full short-iso short-iso-precise short-precise short-monotonic short-unix verbose export json json-pretty json-sse cat)
_describe -t output 'output mode' _output_opts || compadd "$@"
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