Structured admin_level data

Is there some structured data available for admin_level relations in use (e.g. through an overpass query?)

In other words some structured version of the table at https://wiki.openstreetmap.org/wiki/Template:Admin_level_10

Downloading whole pbf files feels like a bit of overkill, when I'm really just looking for something like

{ "SE": { 7: [398021, ...], 4: [...] }, ... }