Yeah, this is already somewhere on the roadmap. These days we have the ability to add custom shaders to native RAGE code fairly easily as well as custom preferences so it should indeed be a relatively simple task to do so clearly and natively in a way that wouldn’t differ much from Rockstar doing so.
I just didn’t know that the shader code was already released - unlike NVIDIA at least AMD does seem to have a much faster pipeline to general availability for devs as per usual 
DLSS still is only behind a whitelisted NDA approval process so isn’t very comparable in terms of where one can use it (NV probably only accepts games that would do well in marketing materials). 