function keySearch($acf) {
 if (is_array($acf) || is_object($acf)) {
  foreach ($acf as &$value) {
   if ( is_array( $value ) || is_object( $value ) ) {
   // error_log( print_r ( $value, true ) );
    if ( array_key_exists( 'type', $value ) ) {
        if ( $value['type'] === 'image' ) {
         $srcset = wp_get_attachment_image_srcset( $value['id'], 'full' );
         $value['asrcset'] = $srcset;
        }
    } else {
     keySearch( $value );
    }
    keySearch( $value );
   }
  }
  unset($value);
 }
}
function acf_to_rest_api($data, $post, $request) {
    if (!function_exists('get_fields')) return $response;
    if (isset($post)) {
    $acf = get_fields($data->data['id']);
    keySearch($acf);
        $data->data['acf'] = $acf;
    }
    return $data;
}
add_filter('rest_prepare_page', 'acf_to_rest_api', 12, 3);