I cannot tell you how excited I am to have this feature: just when I needed!

A small suggestion if you do not mind. Currently if you try to shorten a long SPARQL query with w.wiki, you will get the following message:

URL shortening failed

Maybe it would be useful to recommend the user by default to use Query Chest or even redirect the user. In this way, users who do not read Wikidata weekly summaries will know about the tool and use it.