Register font 'Liberation Mono' so that it can be used with devices using the 'systemfonts' package, i.e. the 'flextable' package and graphic outputs generated with the 'ragg', 'svglite' and 'ggiraph' packages.
See also
Other functions for font management:
addGFontHtmlDependency(),
fonts_cache_dir(),
gfontHtmlDependency(),
install_gfont_script(),
installed_gfonts(),
liberationmonoHtmlDependency(),
liberationsansHtmlDependency(),
liberationserifHtmlDependency(),
register_gfont(),
register_liberationsans(),
register_liberationserif()