By default there's no way to hotlink, if you will, to a post on any platform. Now some apps might be doing something special to get around this, but out of the box this isn't supported at the moment.

Now there is an issue on lemmy itself which I'm exploring that should "fix" this: https://github.com/LemmyNet/lemmy/issues/2987

But I'm not sure how that might translate in a mobile app.

Not presently