How to display the properties of a catalog infoblock in the Yandex.Market export file?

Question

PHP

Good afternoon. Now I am engaged in customization of export to Yandex.Market. I want to add a new tag in xml of vendor type - product brand. Added a new property BREND to the infoblock, but it is not possible to display it in the xml file. Tell me how to get the infoblock value here /bitrix/modules/catalog/load/yandex_run.php. Perhaps it needs to be connected?
Tried to do so

$brand_value=$arResult["DISPLAY_PROPERTIES"]["BRAND"]["VALUE"];
     $strTmpOff.= "<vendor>".yandex_text2xml($brand_value, true)."</vendor>\n";

Thank you.