Using a custom channel in a custom module with NixOS

configuration.nix

{ config, pkgs, ... }:
let
  myCustomChannel = import <myCustomChannel>
    { inherit pkgs; };
in {
  imports = [ (import <myCustomChannel/myCustomModule.nix> { inherit myCustomChannel; }) ];
}

myCustomModule.nix

{ myCustomChannel }:
{ config, lib, pkgs, ... }:
let
  cfg = config.services.myCustomModule;
in
{ options = ...;
  config = ...;
}