Eloquent Laravel - Where in relation Many to Many

I'm developing a site for a project, and on my users screen, I've implemented a filter for access levels. On my screen I have a select with a value 'author' and another value 'admin'.

Only the 'user' and 'role' relationship is a Many to Many relationship.

What I'm doing is grabbing all users and then foreach to unset the authors or admins, depending on the value quit in $ _GET ['access'].

$users = $users->orderBy('name')->paginate($this->pageSize)->appends([
        'acesso' => $request->acesso,
    ]);

    if ($request->has('acesso') && $request->acesso != null){
        $request->acesso == 'admin' ? $unsetIfHasAdminRole = false : $unsetIfHasAdminRole = true;
        foreach ($users as $key => $user){
            if ($user->hasTheRole('admin') == $unsetIfHasAdminRole){
                unset($users[$key]);
            }
        }
    }

The hasTheRole method receives a string and returns a boolean indicating whether the user has that.

I wonder if there is any Eloquent method that automates this? Something like: $users = User::where($user->hasTheRole('admin'))->get();