![](https://programming.dev/pictrs/image/e1388ec9-1bf7-441a-a6ed-f6f60622f0cf.png)
You can use openrss.org RSS feeds. They are there for this exact purpose. For example, you can get an RSS feed of /c/retrogaming .ml
by going to https://openrss.org/programming.dev/c/retrogaming@lemmy.ml. Then all links in the feed will always go to the post on programming.dev instance.
We’re talking about instances having feed content for other instances (on totally different domains), so anything helping with this case would be a “third party service”.