Hello, Can you tell me how to insert a custom field of a Joomla article in the articles list of the articles_scroller addon via the site.php view?

I saw this instruction in the site.php file of the addon articles but it does not work I have this error: trim(): Argument #1 ($string) must be of type string, array given

with this code for Joomla 4:

JLoader::registerAlias('FieldsHelper', 'Joomla\Component\Fields\Administrator\Helper\FieldsHelper');

$custom_fields = FieldsHelper::getFields('com_content.article',$item);

$output .= FieldsHelper::render( 'com_content.article', 'fields.render', array( 'context' => 'com_content.article', 'item' => $item, 'fields' => $custom_fields, ) );

Thanks