Are there markdown custom message to laravel 5.1 in this library?

[arturcesarmelo]

I would like to use something like this.

return (new SlackMessage())
        ->from("New user request on " . config("app.name"))
        ->content(":bangbang: An user has requested a new feedback on " . config("app.name"))
        ->attachment(function ($attachment) use ($notifiable) {
            $attachment->title("Feedback ID: {$notifiable->uuid}")
                ->content("**You can moderate this feedback right away**")
                ->markdown(["title", "text"])
                ->fields([
                    "Request from" => "{$notifiable->user->name} (ID: {$notifiable->user->uuid})",
                    "Request topic" => "{$notifiable->topic->name}",
                ]);
        });