Elementor\TemplateLibrary\Source_Local::export_template PHP Method

    public function export_template($item_id)
    {
        $template_data = $this->get_content($item_id, 'raw');
        $template_data = $this->process_export_import_data($template_data, 'on_export');
        if (empty($template_data)) {
            return new \WP_Error('404', 'The template does not exist');
        }
        // TODO: More fields to export?
        $export_data = ['version' => DB::DB_VERSION, 'title' => get_the_title($item_id), 'type' => get_post_meta($item_id, self::TYPE_META_KEY, true), 'data' => $template_data];
        $filename = 'elementor-' . $item_id . '-' . date('Y-m-d') . '.json';
        $template_contents = wp_json_encode($export_data);
        $filesize = strlen($template_contents);
        // Headers to prompt "Save As"
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename=' . $filename);
        header('Expires: 0');
        header('Cache-Control: must-revalidate');
        header('Pragma: public');
        header('Content-Length: ' . $filesize);
        // Clear buffering just in case
        @ob_end_clean();
        flush();
        // Output file contents
        echo $template_contents;
        die;
    }