How to parse json as not strongly typed strcture?

I know how to parse JSON in to a defined structure with Serialize and Deserialize attributes. But how can I process json tree without knowing structure of JSON in advance?

If you are familiar with Java or Scala, I am looking for analogy of Play Json, i.e. I would like to do in Rust something like the following in Scala:

You can deserialize to a serde_json::Value:

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Great! Thanks, I was looking for this.