Hi,
Having realised what you meant, the only way I could see you using a shortcode for this would be to embed the shortcode in the article or in a template.
Yes, I could probably do it. But there is a big problem with the mechanism: the CURL would be invoked at run time, which would kill your site, and possibly the source site.
I looked at the caching mechanism available for shortcodes (transients API) but that does not provide a permanent storage solution. So, even with that, it’s not going to work in practice. Unless I can find a permanent storage mechanism I don’t think I’ll be adding shortcode invocation.