The specs just say GPS/GNSS, no specification for exactly what they are. I assume it includes Beidou and Glonass to avoid import restrictions.
For chips, nobody has shared any teardown yet. But from previous experiences, it's probably built into the cellular solution at least for Qualcomm chips, for Intel chips it's probably also included but some Apple products with Intel baseband had a separate GNSS chip.
I don't think mini 6 is using Intel chips though.