Gravity PDF footer on last page... maybe?

gravity-pdf-last-page-footer.php

<?php
/*
 * Plugin Name: Gravity PDF Last Page Footer
 * Plugin URI: http://dsgnwrks.pro
 * Description: Add a footer to the last page of a Gravity PDF.
 * Version: 0.1.0
 * Author: Justin Sternberg
 * Author URI: http://dsgnwrks.pro
 */

add_action( 'gfpdf_core_template', function() {
	// Adding some custom styles to move the last-page footer to the bottom and color it red (for demonstration).
	?>
	<style>
		.last-footer {
			color: red;
			position: absolute;
			bottom: 30px;
			left: 30px;
		}
	</style>
	<?php
} );

add_filter( 'gfpdf_mpdf_class', function( $mpdf, $form, $entry, $settings, $Helper_PDF ) {

	// Whatever you want in the last page footer.
	$text = 'HEY I AM A FOOTER on the last page';

	$mpdf->WriteHTML( '<div class="last-footer">'. $text .'</div>' );

	return $mpdf;

}, 10, 5 );

Hello, if you could help me i would be extremely grateful.
How can I specify which form this code will work for? Because i need it to work for a specific form, not for all forms.
Thanks again, I really appreciate your attention