I don't know if this is really the "right" way, but it's working for now.
After you create the file below, edit `filetype_extensions.conf` and add
`Meson=*.build`
## filetypes.Meson.conf
``` [styling=Python]
[keywords] primary=if else elif endif foreach endforeach true false and not or in continue break identifiers=add_global_arguments add_global_link_arguments add_languages add_project_arguments add_project_link_arguments add_test_setup alias_target assert benchmark both_libraries build_target configuration_data configure_file custom_target declare_dependency dependency disabler error environment executable find_library find_program files generator get_option get_variable import include_directories install_data install_headers install_man install_subdir is_disabler is_variable jar join_paths library message warning summary project run_command run_target set_variable shared_library shared_module static_library subdir subdir_done subproject test vcs_tag
[lexer_properties=Python]
[settings] lexer_filetype=Python tag_parser=Meson extension=build comment_single=# mime_type=text/x-meson ```