jayrajsinh Flarum is not built on top of
laravel/laravel, but does use
Illuminate packages. It is standalone software and not meant to run inside a fully bloated Laravel application.
So I can confirm it will never be a package for just Laravel as this would reduce the availability to a lot of our users.
You can give it a shot to integrate Flarum into Laravel if you like. I've tried that in the past. My recommendation would be to keep the two separated to keep upgrades and modifications simpler. You can use Passport (there's a companion extension for Flarum) or built a quick underwater authentication layer to make the integration seamlessly.