As far as I can tell this mongoose adapter does not include any support for Mongoose discriminators.
Is there a plan to add support for discriminators?
If not is there any interest in contributions towards adding support for discriminators?
The discriminator mapping (discriminatorKey) along with the property information for each discriminator type could be extracted from the Mongoose schema and stored on the Property.
Once available in the adminjs frontend the full set of properties could be determined using the discriminatorKey value for a recored.