<?php ~> don't add me / this function calls the script.js

add_filter( 'wp_grid_builder/frontend/register_scripts', 'prefix_register_script' );

//gridbuilder external js script
function prefix_register_script( $scripts ) {

	$scripts[] = [
		'handle'  => 'global',
		'source'  => '/wp-content/themes/mytheme/js/script.js',
		'version' => '1.0.0',
	];

	return $scripts;

}