The discussion below is also related
Checking out the rich links plugin could also help here.
As this discussion continues its simple to have excerpts for the whole of wiki not individual tiddlers however if using a server or publishing static tiddlers along side each tiddler we have a lot more control because each can have its own metadata.
I would also point out when copying a reference from a tiddlywiki rather than just a raw link we could use a template to copy a more advanced reference. In this case the destination may or may not accept the advanced reference making this approach sencitive to the destination. We could cater for discourse and tiddlywiki at least.
So I pose this question. Can we identify a limited set of formats for which we can use to paste “advanced references and links” that will be accepted by most platforms?
This includes the formats discussed in this and related threads.