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/// The `json_parse!` macro automatically generates all `serde_json` `as_` operations based on a provided JSON syntax, binding all variables to the keys. 
/// When a key cannot be converted, Result is propagated using the `?` operator.
/// To handle errors before propagation, you can provide a closure as the first argument to this macro which will be called by `.map_err()`.
/// The data argument has to be of type `&Map<String, Value>`.
/// 
/// ## Usage:
/// 
/// ```rust
/// json_parse!(
///    |err| format!("Could not parse some_data, {}", err),