/usr/share/liblouis/tables/en_US-comp8-ext.tbl is in liblouis-data 3.5.0-1ubuntu0.3.
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 9 10 | #-name: U.S. English 8-dot computer braille for Windows
#-display-name: U.S. English (EBAE) computer braille
#+locale:en-US
#+type:computer
#+dots:8
#+hyphenation:no
#+direction:both
include en-us-comp8-ext.utb
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