Parsing: Serde #[derive(Serialize, Deserialize)] (Crypto Hash) to Nom

Right now I'm trying to implement a parsing technique initially done in serde #[derive(Serialize, Deserialize)] but trying to convert the code base into Nom. The data is currently being parsed as a Crypto hash data type for encryption from my understanding instead of serde_json. What would be the first steps for making the transition from Serde to Nom in this scenario?