Currently we do not have any option to export only the OU's which are in AD connect sync scope. We can only export the entire configuration which is configured in AD connect.
May be in the future we might get this option onboarded.
You can also submit your feedback in Azure feedback portal, where our PM's are directly monitoring public feedbacks.
https://feedback.azure.com/d365community/forum/22920db1-ad25-ec11-b6e6-000d3a4f0789
Let me know if you have any further questions on this.
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