Excel like studio features

This is a feature request.

So people are so used to excel features such as "Data | Filter" that shows a drop-down widget next to column name. When drop-down widget is clicked - all unique options for that column appear.

It would be nice to have such a functionality especially after issuing the following generic query on a brand new graph to learn what is the graph about.
select * {
?s ?p ?o

P.S. I believe that https://www.semspect.de/ goes even further to visualize relationships between types based on number of related nodes.