You can add following code in your theme’s (child theme’s if any) functions.php (Change as required)

add_filter('fep_directory_table_columns', function( $columns ){
	$columns['cus_data'] = 'cus_data';
	return $columns;
});

add_action( 'fep_directory_table_column_content_cus_data', function( $user ){
	echo "Your custom data"; //Change here what you want to show
});

Yes, it can be done. Do you know meta_key of the phone number field of a user?

In above code replace echo "Your custom data"; with echo $user->billing_phone;