How to combine nixos-containers with flakes?

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Hi! I would like to test simple-nixos-mailserver in a separate container. The mailserver comes with its own flake.nix so I would like to combine it with my system’s flake.nix but also I want to test the whole setup in a container first. I would expect the container expression to look like the following:

{ config, pkgs, simple-nixos-mailserver, ...}:
{
  require = [
    simple-nixos-mailserver.nixosModule
  ];
  ... 
  mailserver = {
    enable = true;
    ...
  };
}

The idea worked with my main system where I can pass simple-nixos-maiserver argument from a top-level flake, but how to make it appear using the nixos-container create ... --config-file ... command? I can see that nixos-container has the --flake option, is it related?

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