How do you have these students identified in PS? We use the Alert_Other for staff to include IEP at a glance information for teachers and admin. Then we are able to search for those students and pull a report of the text included in the alert box.
We are also using Special Program Enrollments for our special services identified students.
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Try going to your "State Reporting Help" section using the "?" at the top of PowerSchool. On the left there should be a section called "Data Dictionary". Find your field category on the left, in my case it's "S_MI_STU_GC_X", and use ctrl + F to do a search for "flag". You should be able to find the exact field used to indicate IEP. Then you can just add =1 to find your students with the flag.