Json serialize/deserialize implementations?

[glass-ships]

It doesn't seem like there are Json serialize/deserialize implementations, so I'm having to do some StackOF recommended hackery:

struct TSPS(TermsetPairwiseSimilarity);

// Semsimian doesn't have a Serialize implementation for TermsetPairwiseSimilarity
impl Serialize for TSPS {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut state = serializer.serialize_struct("TSPS", 9)?;
        state.serialize_field("subject_termset", &self.0.subject_termset)?;
        state.serialize_field("subject_best_matches", &self.0.subject_best_matches)?;
        state.serialize_field(
            "subject_best_matches_similarity_map",
            &self.0.subject_best_matches_similarity_map,
        )?;
        state.serialize_field("object_termset", &self.0.object_termset)?;
        state.serialize_field("object_best_matches", &self.0.object_best_matches)?;
        state.serialize_field(
            "object_best_matches_similarity_map",
            &self.0.object_best_matches_similarity_map,
        )?;
        state.serialize_field("average_score", &self.0.average_score)?;
        state.serialize_field("best_score", &self.0.best_score)?;
        state.serialize_field("metric", &self.0.metric)?;
        state.end()
    }
}

Or maybe there is and I'm just not doing this quite right? (Very possible, still very new to Rust)