How to load middleware in Service Provider and access it on route in laravel?

I'm using https://github.com/nWidart/laravel-modules to create module based laravel application. All modules are residing in Modules directory. I've defined middleware HelperMiddleware in module. I tried to register this middleware in module's service provider in boot() as :

    $router = $this->app['router'];
    $router->aliasMiddleware('gateway', HelperMiddleware::class);

But I can't access gateway in module's route.

How can I access the middleware without touching main laravel files?

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