That might be kind of difficult because each post is going to be different depending on instance, so there won’t be one universal link to it. What I would do is post a link to the community like this “/c/CommunityName@instance.tld”

Edit: as an example, this community for me is https://monero.town/c/lemmy_support@lemmy.ml which i can shorten to /c/lemmy_support@lemmy.ml

There’s unfortunately no instance-agnostic way like how you can send communities with !lemmy@lemmy.ml. something about the post id being different on each instance makes it too difficult for them to figure out, and they believe it’s not a high enough priority to think up a solution.

Like this.

https://lemmy.ml/post/8102580