How can I add condition in rules laravel?

My controller like this :

<?php
use App\Http\Requests\StoreReceiveOrderRequest;
class SellController extends Controller
{
    public function receiveOrder(StoreReceiveOrderRequest $request)
    {
        dd($request->all());
        ...
    }
}

Before executed statement in the receiveOrder method, it will check rules on the StoreReceiveOrderRequest

The StoreReceiveOrderRequest like this :

<?php
namespace App\Http\Requests;
use Illuminate\Foundation\Http\FormRequest;
class StoreReceiveOrderRequest extends FormRequest
{
    public function rules()
    {
        return [
            'is_follow_up'=>'required',
            'note'=>'max:300' // I want to make this to be required if is_follow_up = n
        ];
    }
}

the result of dd($request->all());, there are 2 results, depending user input

If the is_follow_up = y, the result like this :

Array
(
    [is_follow_up] => y
)

If the is_follow_up = n, the result like this :

Array
(
    [is_follow_up] => n
    [note] => test
)

If is_follow_up = n, I want to make the note is required

If is_follow_up = y, the note is not required

Seems it must to add condition on the rules

How can I do it?

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