Include Gutenberg blocks in WP-API response

functions.php

<?php
/**
 * Include all Gutenberg blocks from content in REST API response
 *
 * 
 */
function my_theme_blocks_to_rest_api( $response, $post, $request ) {
	if ( ! function_exists( 'parse_blocks' ) ) {
		return $response;
	}
	if ( isset( $post ) ) {
		$response->data['blocks'] = parse_blocks( $post->post_content ); // https://developer.wordpress.org/reference/functions/parse_blocks
	}
	return $response;
}
add_filter( 'rest_prepare_post', 'my_theme_blocks_to_rest_api', 10, 3 );
add_filter( 'rest_prepare_page', 'my_theme_blocks_to_rest_api', 10, 3 );
//add_filter( 'rest_prepare_{my_custom_posttype}', 'my_theme_blocks_to_rest_api', 10, 3 ); // Custom posttype