You already can load those, though? It’ll cause a big initial download, but if you have audio files and a game.dat151.rel + sounds.dat54.rel for it, you can load them.
For example:
files {
'gd/dlcthing_game.dat151.nametable',
'gd/dlcthing_game.dat151.rel',
'gd/dlcthing_sounds.dat54.nametable',
'gd/dlcthing_sounds.dat54.rel',
'dlc_thing/carcar.awc',
'dlc_thing/carcar_npc.awc',
}
data_file 'AUDIO_GAMEDATA' 'gd/dlcthing_game.dat'
data_file 'AUDIO_SOUNDDATA' 'gd/dlcthing_sounds.dat'
data_file 'AUDIO_WAVEPACK' 'dlc_thing'
(taken from this GTA5-Mods mod, use <audioNameHash>carcar</audioNameHash>
in your add-on vehicles.meta. the ‘please don’t reupload’ is ignored given how only audio files were used that were ripped from another video game, so the person compiling the files has no rights over the data itself)