Пользовательское поле (свойство раздела) Bitrix - строка с описанием

PropStringDesc.php

<?php

// $eventManager->addEventHandler("main", "OnUserTypeBuildList", ['PropStringDesc', "getUserTypeDescription"]);

class PropStringDesc extends \CUserTypeString
{
    public function getUserTypeDescription()
    {
        return [
            'USER_TYPE_ID' => 'PropStringDesc',
            'CLASS_NAME'   => __CLASS__,
            'DESCRIPTION'  => 'Строка с описанием',
            'BASE_TYPE'    => 'string'
        ];
    }
    
    /**
     * Вывод в админке
     *
     * @param [type] $arUserField
     * @param [type] $arHtmlControl
     * @return void
     */
    public function getEditFormHTML($arUserField, $arHtmlControl)
    {
        return '
            <table border="0" cellspacing="0" cellpadding="0" width="100%" class="internal">
                <tbody>
                <tr class="heading">
                    <td>Строка</td>
                    <td>Описание</td>
                </tr>
                <tr>
                    <td align="center">
                        <input type="text" name="'.$arHtmlControl["NAME"].'[NAME]" value="'.$arHtmlControl['VALUE']['NAME'].'" /></td>
                    <td align="center">
                        <input type="text" name="'.$arHtmlControl["NAME"].'[DESC]" value="'.$arHtmlControl['VALUE']['DESC'].'" />
                    </td>
                </tr>
                </tbody>
            </table>
        ';
        
        return $html;
    }
    
    /**
     * Сохранение в БД
     *
     * @param [type] $arUserField
     * @param [type] $value
     * @return string
     */
    public function OnBeforeSave($arUserField, $value): string
    {
        $value = \Bitrix\Main\Web\Json::encode($value);
        return $value;
    }

    /**
     * Извлечение из БД
     *
     * @param [type] $arProperty
     * @param [type] $arValue
     * @return array
     */
    public function onAfterFetch($arProperty, $arValue): array
    {
        if (!empty($arValue["VALUE"])) {
            $arValue = \Bitrix\Main\Web\Json::decode(html_entity_decode($arValue["VALUE"]));
        }

        return $arValue;
    }
}