Adding content in wc blocks with php only

wc-blocks.php

<?php

add_filter( 'render_block', 'merchant_woocommerce_cart_block_do_actions', 9999, 2 );

function merchant_woocommerce_cart_block_do_actions( $block_content, $block ) {
	$blocks = array(
		'woocommerce/cart',
		'woocommerce/filled-cart-block',
		'woocommerce/cart-items-block',
		'woocommerce/cart-line-items-block',
		'woocommerce/cart-cross-sells-block',
		'woocommerce/cart-cross-sells-products-block',
		'woocommerce/cart-totals-block',
		'woocommerce/cart-order-summary-block',
		'woocommerce/cart-order-summary-heading-block',
		'woocommerce/cart-order-summary-coupon-form-block',
		'woocommerce/cart-order-summary-subtotal-block',
		'woocommerce/cart-order-summary-fee-block',
		'woocommerce/cart-order-summary-discount-block',
		'woocommerce/cart-order-summary-shipping-block',
		'woocommerce/cart-order-summary-taxes-block',
		'woocommerce/cart-express-payment-block',
		'woocommerce/proceed-to-checkout-block',
		'woocommerce/cart-accepted-payment-methods-block',
	);
	if ( in_array( $block['blockName'], $blocks ) ) {
		ob_start();
		echo $block_content;
		do_action( 'merchant_before_' . $block['blockName'], $block );
		do_action( 'merchant_after_' . $block['blockName'], $block );
		$block_content = ob_get_contents();
		ob_end_clean();
	}
	return $block_content;
}
add_action('merchant_before_woocommerce/cart-line-items-block', function($block) {
//  print_r($block);
});