Newbie - Correct place to add a Nix package buildinput override?

[victorhooi]

I'm trying to install the urh package - source here:

https://github.com/NixOS/nixpkgs/blob/nixos-24.05/pkgs/applications/radio/urh/default.nix

However, I wanted to enable UHD (USRP Hardware Drivers) support for this package.

It seems there's already an override for that I can use (link).

However, I can't seem to figure out the correct way to enable this.

Naively, I did try to add this to modules/shared/packages.nix directly:

❯ tail modules/shared/packages.nix 
python3
poetry
k3d
kubectl
sdrangel
uhd
urh = {
  USRPSupport = true
}
]

However, I then got a bunch of syntax errors about the "=" - and it seems that may not be the right place to add it?

I also tried adding it to modules/shared/default.nix:

❯ cat modules/shared/default.nix 
{ config, pkgs, ... }:

let
  emacsOverlaySha256 = "06413w510jmld20i4lik9b36cfafm501864yq8k4vxl5r4hn0j0h";
in
{
  
  nixpkgs = {
    config = {
      allowUnfree = true;
      allowBroken = true;
      allowInsecure = false;
      allowUnsupportedSystem = true;
    };

    urh = {
      USRPSupport = true;
    };

However, it then says it's not a recognised option - so guessing that's not the right place either?

       error: The option `nixpkgs.urh' does not exist. Definition values:
       - In `/nix/store/9gr0nf75vhfr7hmf2zci3hsf9by8lnsp-source/modules/shared':
           {
             USRPSupport = true;
           }

Does anybody know where the correct place to add this option in these templates is please?