there is no JSON/XML parser integrated in Embedded Wizard. But creating of GUI components dynamically is not a problem. Please see the section Compose the component programmatically.
If you don't depend on the XML/JSON syntax I would suggest to design a simple syntax for your particular purpose and implement the corresponding parser. Or you would need to implement a JSON/XML parser or integrate an existing one to your project. For simple application cases you can pass the UI description in a string to EmWi and process/parse the string in Chora. Please see the description of the string data types.
I hope it helps you further.
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