Transfer/ Unbox Julia's DataFrame objects and use as C++ object

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Yeah, I see that I should give another try to Arrow. However, Imagine that we are not talking about data frames, but other simpler but still structured data, like array of strings (as described in the problem) or a dictionary in Julia which I want to access from C++ directly. Let me be more precise in the questions:

  1. I’ve read that jl_string_ptr is used to access to strings (instead of using an hypothetical jl_unbox_string), but How to access if such strings are inside an array, like in the problem I explained?

  2. How can I access/ “unbox” dictionary (which values are arrays) or JSON objects defined in Julia, from C++?

This is very useful in scenarios in which I generate data from Julia but still I want to use my C++ algorithms as they are. I’d like access such structures from my C++ code, and the legacy code does not use Arrow, but I can manage such objects (dictionaries and arrays of strings).

Thanks!