woocommerce/plugins/woocommerce-admin/docs/examples/extensions/add-navigation-items/js/index.js

/**
 * External dependencies
 */
import { __ } from '@wordpress/i18n';
import { Button } from '@wordpress/components';
import { registerPlugin } from '@wordpress/plugins';
import { WooNavigationItem } from '@woocommerce/navigation';

const MyPlugin = () => {
	const handleClick = () => {
		alert( 'Menu item clicked!' );
	};

	return (
		<WooNavigationItem item="example-category-child-2">
			<Button onClick={ handleClick }>
				{ __( 'JavaScript Example', 'plugin-domain' ) }
			</Button>
		</WooNavigationItem>
	);
};

registerPlugin( 'my-plugin', {
	render: MyPlugin,
	scope: 'woocommerce-navigation',
} );