You can load the script of the block within the php file

markup.php

<?php

/**
 * Block markup
 *
 * @package MyNamespace\Blocks\MyBlock
 *
 * @var array    $attributes         Block attributes.
 * @var string   $content            Block content.
 * @var WP_Block $block              Block instance.
 * @var array    $context            Block context.
 */

if ( ! wp_script_is( 'my-script-example' ) ) {

	wp_enqueue_script(
		'my-script-example',
		'https://example.com/script.js',
		Utility\get_asset_info( 'my-block', 'dependencies' ),
		Utility\get_asset_info( 'my-block', 'version' ),
		true
	);
}

?>
<div <?php echo get_block_wrapper_attributes(); // phpcs:ignore ?>>
  ...
</div>