/usr/share/subiquity/subiquity-loadkeys is in subiquity 0.0.29.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
loadkeys - <<EOF
string F91 = "\033[Z"
keycode 15 = Tab F91
EOF
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