Add a title to the CSV exported file

gfexcel-add-title.php

<?php //DO NOT LINE

add_filter('gfexcel_renderer_matrix', static function (array $rows) {
    // Make up the title
    $title = 'text';

    // Wrap in array to become a row.
    $title = [$title];
    array_unshift($rows, $title);

    return $rows;
});