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Thanks for reaching out.
I would like to share this documentation regarding Adding third party libraries in the Intel System Studio IoT Edition using the Intel Package Manager, you will also be able to add additional repositories and then add packages from there. In addition to that, I found this thread: How to include files from external folder in System Studio where the user includes external libraries to his project. I believe you will find useful information in those links to achieve what you need,
Let me know if this information helps.