/usr/share/X11/locale/km_KH.UTF-8/Compose is in libx11-data 2:1.6.3-1ubuntu2.
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 7 8 | include "/usr/share/X11/locale/en_US.UTF-8/Compose"
# Khmer digraphs
<U17ff> : "ាំ"
<U17fe> : "ោះ"
<U17fd> : "េះ"
<U17fc> : "ុំ"
<U17fb> : "ុះ"
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