Sometimes ago I built a connector for Google Data Studio which allows issuing SPARQL SELECT queries to the endpoints and using the results in your reports. We use it in production.
The description and an example report is in datastudio-sparql-connector repo.
P.S. The connector isn’t available in the community connectors gallery yet, because of some organizational issues. But if there’s enough interest, I may find time to solve them.
Looking forward to your feedback!