We added the feature in our TODO list and actually I expect the see something similar with the Q1 release. Please check our road map.
Actually we will have shared content option which will allow you to add the entire content item in the ContentBlock designer.
We will consider implementing an option for adding only a Hyperlink to the item instead of wrapping the entire content. In this case the situation is more complicated, because you should have a page that displays your single content item.
The task ID for this request is 106789
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