Currently only regular custom fields (for posts, pages, and custom post types) are supported due to the very different structure of buddypress.
Are you using any plugin for custom fields or the built in ones? I'm currently working on the upcoming version of the plugin, I can add your request to the list if you want to. I can't promise the implementation, but I can try.Best,
If you like my products, don't forget to rate them on codecanyon :)