Примеры исходного кода к статье https://pgooood.medium.com/174ac881a93a

class.php

<?php
use Bitrix\Main\Engine\Contract\Controllerable;

class ajaxTest extends \CBitrixComponent implements Controllerable {

    function executeComponent(){
        $this->arResult = [
            'COMPONENT_ID' => $this->componentId()
            ,'SCRIPT_PATH' => $_SERVER['SCRIPT_NAME']
        ];
        $this->includeComponentTemplate();
    }

    function configureActions(){
        return [
            'exampleRequest' => [
                'prefilters' => []
                ,'postfilters' => []
            ]
        ];
    }

    function exampleRequestAction($componentId, $scriptCast){
        if(($scriptPath = base64_decode($scriptCast))
            && ($arComponentData = self::componentData(
                    $componentId,
                    $scriptPath
                ))
        ){
            /* полученный $arParams */
            var_dump($arComponentData['DATA']['PARAMS']);
        }
        return [
            /* ответ на аякс-запрос */
        ];
    }

    protected function componentId(){
        $entryId = 'sometext';
        $m = null;
        /* вычленим только уникальную цифровую часть идентификатора */
        if(preg_match(
            '/^bx_(.*)_' . $entryId . '$/',
            $this->getEditAreaId($entryId),
            $m
        )){
            return $m[1];
        }
    }

    protected static function pageComponents($scriptPath){
        if(is_file($absPath = $_SERVER['DOCUMENT_ROOT'] . $scriptPath)){
            $arCounter = [];
            $fileContent = file_get_contents($absPath);
            $arComponents = \PHPParser::ParseScript($fileContent);
            foreach ($arComponents as &$r){
                $arCounter[$r['DATA']['COMPONENT_NAME']]++;
                /* делаем ID как в методе getEditAreaId */
                $r['ID'] = abs(crc32($r['DATA']['COMPONENT_NAME']
                        . '_' . $arCounter[$r['DATA']['COMPONENT_NAME']]));
            }
            return $arComponents;
        }
        throw new \Exception('File [' . $scriptPath . '] not found');
    }

    protected static function componentData($componentId,$scriptPath){
        if($componentId
            && ($arComponents = self::pageComponents($scriptPath))
        ){
            foreach($arComponents as $arData)
                if($componentId == $arData['ID'])
                    return $arData;
        }
    }

}

component_epilog.php

<?if(!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true)die();

CJSCore::Init(['ajax']);

template.php

<?php
if(!defined("B_PROLOG_INCLUDED") || B_PROLOG_INCLUDED!==true) die;

?><script>
BX.ajax.runComponentAction(
  'ajaxTest'
  ,'exampleRequest'
  ,{
    mode: 'class'
    ,data: {
      componentId: <?=$arResult['COMPONENT_ID']?>
      ,scriptCast: '<?=base64_encode($arResult['SCRIPT_PATH'])?>'
  }
})
.then(function(response){
  if(response.status === 'success'){
    /* запрос выполнен успешно */
  }
});
</script>