Access Request object from Router Group Laravel (Lumen)

I want to access the request object to get request parameters in my $router group, here is my code.

$router->group([
    //'middleware'    => 'cors',
    'middleware'    => 'roles',
    'prefix'        => 'abc'
],
function () use ($router) {

     // access the Request $request instance here to get the params, $requets->all();
    dd('$request');

});

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