How to add a NUR package to a flake

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1

Hello, I would appreciate advice on how to add a NUR package (pyrosm-from-nur in the example below) to the flake:

{
  description = "Flake with NUR package";
  
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "nixpkgs/nixos-21.11";
    nur.url = github:nix-community/NUR;
  };
  
  outputs = { self, nixpkgs, flake-utils, nur }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        
        proj-name = "baz";

        method-one-name = "method-one-${proj-name}";
        method-one-buildInputs = with pkgs; [ cowsay coreutils ]; 
        # method-one-buildInputs = with pkgs; [ cowsay coreutils pyrosm-from-nur ]; 
        method-one-script = (pkgs.writeScriptBin method-one-name ''
        #!/usr/bin/env bash
        cowsay "one!"
        '').overrideAttrs(old: {
          buildCommand = "${old.buildCommand}\n patchShebangs $out";
        });

      in rec {

        defaultPackage = packages.${proj-name};
        
        packages.${proj-name} = pkgs.symlinkJoin {
          name = "${proj-name}";
          paths = [ method-one-script ] ; 
          buildInputs = [ pkgs.makeWrapper ]; 
          postBuild = ''
            wrapProgram $out/bin/${method-one-name} --prefix PATH : ${pkgs.lib.makeBinPath method-one-buildInputs}
            '';
        };

        apps.method-one  = {
          type = "app";
          program = "${packages.${proj-name}}/bin/${method-one-name}";
        };

        devShell =  pkgs.mkShell {
          buildInputs = [ self.packages.${system}.${proj-name} ]
          ++ method-one-buildInputs;
        };        
      }
    );
}

Try with

nix develop
 method-one-baz 
 ______ 
< one! >
 ------ 
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Many thanks.