QM 5.0.1 query using RPE REST and feed schema

Hello,

I created a datasource schema thro the REST discovery that contains a query for a specific project area, now I have the regular schema qm and feed, how can I iterate for get detailed information, example I have the testcase title and id, and I want to get the test script step result, so I need to iterate it thro the restresult and stept result, but how could I do that join and get that information for these records??

thank you