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You can convert a DataFrame from Polars to serde_json::Value using serialization in the following way:

1. Serialize the DataFrame to a JSON string.

let df = /* your dataframe */;
let json_str = df.to_json().unwrap();

1. Deserialize the JSON string to a serde_json::Value.

let json_val: serde_json::Value = serde_json::from_str(&json_str).unwrap();

The json_val variable will hold the deserialized JSON value of the DataFrame.