Laravel - How to get select value and pass it to RegisterController create()

I have the following problem, how can I get the value of a select on my register.blade.php?

When a user register he should be able to select a role, each role has an id and once he clicks on the submit button the role id should be assigned to his rol_id on users table.

But I don't know how to get the value of the selected id once I use the create method on RegisterController.

Part of the register.blade.php that has the select:

<div class="form-group row">
    <label for="rol_id" class="col-md-4 col-form-label text-md-right">Rol:</label>
    <div class="col-md-6">
        <select class="form-select" name="rol_id" id="rol_id">
            <option value="2">User</option>
            <option value="3">Editor</option>
            <option value="1">Admin</option>
        </select>
    </div>
</div>

What should I put on the rol_id? This is the create method where I should assign the id of the role selected:

/**
 * Create a new user instance after a valid registration.
 *
 * @param  array  $data
 * @return \App\Models\User
 */
protected function create(array $data)
{
    $user = User::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'password' => Hash::make($data['password']),
        'rol_id' =>
    ]);

    return $user;
}

If you need more methods/classes I'll provide it.

UPDATE: Also Im facing another problem, once a User is created the rol_id gets assigned, but I have another table called role_user where there is the user id and the rol id, there is no much sense on having that pivot table if users can only have one role right?

Thanks!