How to set different `nixpkgs.config` per host?

[yajo]

I have some systems with AMD GPU and others with NVIDIA GPU.

I want to set nixos.config.cudaSupport = ture in some, and nixos.config.rocmSupport = ture in others.

How to do that if I use this lib?

[TakodaS]

This may be possible using channels. See #40.