JanusGraph custom types



Is there a way to add custom property types to JanusGraph (similar to RelationIdentifier / Geoshape) to be later used by the 
GraphSON serializer? Ideally without re-building JanusGraph.

Due to some downstream limitations, we sometimes can't serialize Python datetime objects. It would be great if we could somehow add a custom step such that .values("date-field").as_iso() would return the field in ISO 8601.

Many thanks!

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