So while I'm helping with the Wikidata - Schema.org mappings, a request came in to expose subcategories of an existing Wikipedia category.

For example, say I start with this topic: https://www.wikidata.org/wiki/Q27119725  Parking facilities

The topic's main category is shown as "Category:Parking facilities" and that has links to Wikipedia, specifically a Wikipedia category link, and where the WP category page has subcategories that I would like to expose somehow in whichever way is easiest currently with our tools, apis, etc.

Can it all be done in SPARQL against some services that already expose WP subcategories given a specific category ?  Or is there an API that does this already ?  other tools that might expose WP categories ?

The IDEAL GOAL is to query 'equivalent class' = schema.org/ParkingFacility and get back the WP categories in one shot or query or api call.

Any gurus ?