How to return the result of the component to a variable?

Question

1C-Bitrix

On the side of the ajax.php file, the sale.basket.basket.linetmp component (basket) is processed,
then the ajax file returns the result of the work in the form of html, and this html is added to the layout block on the frontend side.

ajax.php file code

define('STOP_STATISTICS', true);
define('NOT_CHECK_PERMISSIONS', true); 

if (!isset($_POST['siteId']) || !is_string($_POST['siteId']))
  die();

if (!isset($_POST['templateName']) || !is_string($_POST['templateName']))
  die();

if ($_SERVER['REQUEST_METHOD'] != 'POST' ||
  preg_match('/^[A-Za-z0-9_]{2}$/', $_POST['siteId']) !== 1 ||
  preg_match('/^[.A-Za-z0-9_-]+$/', $_POST['templateName']) !== 1)
  die;

define('SITE_ID', $_POST['siteId']);
require_once($_SERVER['DOCUMENT_ROOT'].'/bitrix/modules/main/include/prolog_before.php');
if (!check_bitrix_sessid())
  die;

$_POST['arParams']['AJAX'] = 'Y';

$APPLICATION->RestartBuffer();
header('Content-Type: text/html; charset='.LANG_CHARSET);
$APPLICATION->IncludeComponent('bitrix:sale.basket.basket.linetmp', $_POST['templateName'], $_POST['arParams']);

It is necessary that the ajax file return json, since in addition to layout it is required to return several more basket parameters and it is easier to do this in one request, the result of the operation of the sale.basket.basket.linetmp component must be saved to a variable. Tell me how can this be done?

Answer 1

If it's fast, then copy the component to your namespace. And in your class.php or component.php file, output $arResult.
Or you can leave the template empty, and display $arResult in component_epolog.php as an option.
But I wouldn't do that. It's better to write a handler without using a component.