As suggested by @Smalyshev , it may be probably fine to use simple values, since the most important piece of information is the globe.
See https://github.com/wikimedia/mediawiki-extensions-Wikibase/blob/master/repo/includes/Rdf/Values/GlobeCoordinateRdfBuilder.php
Description
Description
| Status | Subtype | Assigned | Task | ||
|---|---|---|---|---|---|
| Open | None | T173750 Handle complex data types | |||
| Resolved | Hjfocs | T173759 Handle geo-coordinates data values |