a concrete example:

```nix
    services.swayidle = {
      enable = true;
      wait = true;
      beforeSleep = "echo beforeSleep";
      afterResume = "echo afterResume";
      lock = "echo lock";
      unlock = "echo unlock";
      idleHint = 33;
      timeouts = [
        {
          timeout = 50;
          command = "echo timeout50";
        }
        {
          timeout = 100;
          command = "echo timeout100";
          resumeCommand = "echo timeout100Resume";
        }
      ];
    };
```