WordPress Version: 5.1
/**
* Display generic dashboard RSS widget feed.
*
* @since 2.5.0
*
* @param string $widget_id
*/
function wp_dashboard_rss_output($widget_id)
{
$widgets = get_option('dashboard_widget_options');
echo '<div class="rss-widget">';
wp_widget_rss_output($widgets[$widget_id]);
echo '</div>';
}