Shoudln't this be Place rather than Reservation? Same below.

Hm, Googles example data uses the Place type directly rather than a specialized sub-type: https://developers.google.com/gmail/markup/reference/rental-car . This means on deserialization we would fail with their data right now. I see a few options to address this:
(1) make the properties in RentalCarReservation QVariants to accept both types
(2) convert Place to RentalCarPlace in JsonLdImportFilter
(3) if we don't need any extra properties on RentalCarPlace on top of Place (now and foreseeable future), use Place directly and convert RentalCarPlace to Place in the import filter.