Add custom tab with short description

I add a custom tab to product detail page with functions.php in childtheme.
Now i try to add the product short description to this tab.
But how?

In functions.php we add

// extra Tab for short description
add_filter( 'woocommerce_product_tabs', 'woo_new_product_tab' );
function woo_new_product_tab( $tabs ) {
	// Adds the new tab
	$tabs['test_tab'] = array(
		'title' 	=> __( 'SHORTDESCRIPTION', 'woocommerce' ),
		'priority' 	=> 15,
		'callback' 	=> 'woo_new_product_tab_content'
	);
	return $tabs;
}

And now i try to add shortdescription to this tab:

function woo_new_product_tab_content() {
	// The new tab content
	WHICH ELEMENT NAME TO ENTER HERE TO GET THE SHORT DESCRIPTION?
}

Can you help me please with this line?
I dont know what is the command line to get the short description.

Best wishes