For instance, this one (link to a post to !memes@reddthat.com): https://reddthat.com/post/20260613
Pasting it in your search bar should give you this kind of results:
You can then click on it to access the post from your instance (in this example, lemmy.zip: https://lemmy.zip/post/16918691)
relevant Github feature requests, put thumbs up reactions if you want them to be prioritized, click subscribe if you want to be notified about progress
https://github.com/LemmyNet/lemmy/issues/2987
https://github.com/LemmyNet/lemmy-ui/issues/2318