@shockoMS Discussed the above mentioned issue with my team, there're no powershell cmdlets available to achieve this ask.
Please note that you should use AADC config wizard instead to configure domain/OU filter, not the option in Synchronization Service Manager.
Let me know if you have any further questions, feel free to post back.
Please remember to "Accept Answer" if answer helped, so that others in the community facing similar issues can easily find the solution.