As requested, moving this discussion: https://gis.stackexchange.com/questions/453121/geotools-create-feature-with-nested-compound-attributes to the dev list.
My solution has been to copy the geoson-core module locally and make changes in the reader/writer to use the ObjectMapper functionality when encountering a feature attribute type not directly supported. This allows easy serialization/deserialization via the Jackson annotation mechanism. One could also define a Jackson Module for custom object types and register it with the ObjectMapper instance in the reader/writer. One drawback of this approach is that it exposes Jackson as the underlying mechanism.
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