I consider offering a template at Wikidata that displays daily updated values about property usage over time, as a graph. The values are cached in a Tool Labs database, since it is too expensive to collect them on the fly. Once they are in the Tool Labs database, they don’t change any more.
To my knowledge the wikiraw:// protocol allows data retrieval from remote sources – but not yet from .wmflabs.org. Would it be possible to whitelist that source?