How to implement FormRequest in Lumen 8 app ?

Hi all, In my lumen 8.0 app I want to add requests into store method, like :

use App\Http\Requests\PageRequest;
use Illuminate\Support\Facades\File;
use Illuminate\Support\Facades\Storage;
use Validator;

class PageController extends Controller
{

    public function store(PageRequest $request)
    {

and copypasting from laravel app into Http/Requests/PageRequest.php :

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Http\Request;
use App\Models\Page;

class PageRequest extends FormRequest
{

I got error :

Class 'Illuminate\Foundation\Http\FormRequest' not found",

Reading here https://lumen.laravel.com/docs/8.x/requests and in net looks like FormRequest is not implemented in lumen now?

My composer.json :

{
    "name": "laravel/lumen",
    "description": "The Laravel Lumen Framework.",
    "keywords": ["framework", "laravel", "lumen"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": "^7.3|^8.0",
        "cviebrock/eloquent-sluggable": "^8.0",
        "dusterio/lumen-passport": "^0.3.4",
        "flipbox/lumen-generator": "^8.2",
        "guzzlehttp/guzzle": "^7.3",
        "intervention/image": "^2.5",
        "laravel/lumen-framework": "^8.0",
        "league/flysystem": " ~1.0"
    },
    "require-dev": {
        "fakerphp/faker": "^1.9.1",
        "mockery/mockery": "^1.3.1",
        "phpunit/phpunit": "^9.3"
    },
    "autoload": {
        "files": [
            "app/library/helper.php"
        ],
        "psr-4": {
            "App\": "app/",
            "Database\Factories\": "database/factories/",
            "Database\Seeders\": "database/seeders/"
        }
    },
    "autoload-dev": {
        "classmap": [
            "tests/"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "scripts": {
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ]
    }
}

Searching in next I found some related articles, like : https://medium.com/the-andela-way/implementing-custom-form-request-with-lumen-1a79dca29b1d https://medium.com/@mikimaineamdu/how-to-bring-back-form-request-to-lumen-5-x-fb67e4a51f53 But they seems rather old. Are some some suitable for laravel 8 app now?

Thanks!