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For me, your asked feature is not much relevant to implemented in the core files from the widget. But for this custom like features we added a filter (https://developer.www.ads-software.com/reference/functions/add_filter/) which you can applay to the title: ‘widget_title’.
Use the filter and add a HTML attribute to the generated title output.
Your code is like this and write it in your existing function.php:
function example_callback( $title ) {
$title->addAttribute(“target”,”_blank”);
return $title;
}
add_filter( ‘widget_title’, ‘example_callback’ );