DLSS Support
Technically someone could implement DLSS support in the upscaling module for NVIDIA GPUs on Windows and Linux. Here is their Github repository offering the required headers and libraries.
I personally don't think it's ideal to have binaries in place with proprietary code but maybe NVIDIA will release the source code one day as with PhysX for example. It definitely provides a high quality option for upscaling with Vulkan support.
Theoretically there's also another option from Intel with XeSS. But currently it only supports DirectX 12.