Assign Role in migration file using spaite permission pacakage

I need to insert a "super admin" user to user table during user table migration . along with that I need to assign role for user.

$userData = DB::table('users')->insert(
                array('employee_id' => '1', 'name' => 'Admin', 'username' => 'admin', 'email' => '[email protected]', 'password' => Hash::make('123456'),'status' => '1'),
        );

       
        $role = Role::create(['name' =>'Admin']);
        $userData->assignRole('Admin');

I am getting error call to undefined function assignRole()

I have added following in top of migration file

use Spatie\Permission\Models\Role;
use Spatie\Permission\Models\Permission;