Custom meta boxes in RSS feed

Try, not tested, 

add_filter('the_content_feed','add_my_fields_to_rss');

function add_my_fields_to_rss($content) {
  global $post;
  $mymeta = get_post_meta($post->ID, 'my_meta', true);
  $content .= $mymeta;
  return $content;
}

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