setExtraField

void public
\Bitrix\Main\UrlPreview\HtmlDocument::setExtraField(
 string $fieldName,
 string $fieldValue
);

Non-static method sets additional metadata fields.

Parameter	Description	Version
$fieldName	Field name. Available values: FAVICON: `$fieldValue` must contain URL for favicon IMAGES: `$fieldValue` must contain array with image URLs, found in document. В других случаях `$fieldValue` must contain simple text.
$fieldValue	Field value.