Schema: geoMidpoint
Schema: geoMidpoint Example Markup
The following are examples of markup written in json+ld that include the correct usage for Schema: geoMidpoint.
GeoCircle
GeoCircle JSON-LD example — GeoShape subtype with geoMidpoint (GeoCoordinates) and geoRadius (Distance / Number / Text). Canonical form for 'within X km' service areas.