woocommerce/packages/js/create-product-editor-block/plugin-templates/$slug.php.mustache

<?php
/**
 * Plugin Name:          {{title}}
{{#pluginURI}}
 * Plugin URI:           {{{pluginURI}}}
{{/pluginURI}}
{{#description}}
 * Description:          {{description}}
{{/description}}
 * Version:              {{version}}
 * Requires at least:    6.2
 * WC requires at least: 7.8
 * Requires PHP:         7.4
{{#author}}
 * Author:               {{author}}
{{/author}}
{{#license}}
 * License:              {{license}}
{{/license}}
{{#licenseURI}}
 * License URI:          {{{licenseURI}}}
{{/licenseURI}}
 * Text Domain:          {{textdomain}}
{{#domainPath}}
 * Domain Path:          {{{domainPath}}}
{{/domainPath}}
{{#updateURI}}
 * Update URI:           {{{updateURI}}}
{{/updateURI}}
 *
 * @package              {{namespace}}
 */

use Automattic\WooCommerce\Admin\BlockTemplates\BlockTemplateInterface;
use Automattic\WooCommerce\Admin\Features\ProductBlockEditor\ProductTemplates\ProductFormTemplateInterface;
use Automattic\WooCommerce\Admin\Features\ProductBlockEditor\BlockRegistry;


/**
 * Registers the block using the metadata loaded from the `block.json` file.
 * Behind the scenes, it registers also all assets so they can be enqueued
 * through the block editor in the corresponding context.
 *
 * @see https://developer.wordpress.org/reference/functions/register_block_type/
 */
function {{namespaceSnakeCase}}_{{slugSnakeCase}}_block_init() {
	if ( isset( $_GET['page'] ) && $_GET['page'] === 'wc-admin' ) {
		BlockRegistry::get_instance()->register_block_type_from_metadata( __DIR__ . '/build' );
	}
}
add_action( 'init', '{{namespaceSnakeCase}}_{{slugSnakeCase}}_block_init' );

function {{namespaceSnakeCase}}_{{slugSnakeCase}}_add_block_to_product_editor( BlockTemplateInterface $template ) {
	if ( $template instanceof ProductFormTemplateInterface && 'simple-product' === $template->get_id() ) {
		$basic_details = $template->get_section_by_id( 'basic-details' );

		if ( $basic_details ) {
			$basic_details->add_block(
				[
					'id' 	     => '{{namespace}}-{{slug}}',
					'order'	     => 40,
					'blockName'  => '{{namespace}}/{{slug}}',
					'attributes' => [
						'message' => '{{title}}',
					]
				]
			);
		}
	}
}
add_filter( 'woocommerce_block_template_register', '{{namespaceSnakeCase}}_{{slugSnakeCase}}_add_block_to_product_editor', 100 );