I am not sure about your exact requirement but if you can use repeating grid layout then you can source it with report definition and in this report definition you can use class join to get the data from two different class.
Please let me know if this is what you are looking for.
I tried using class join but it is not working, it is retrieving data in the report while running report definition it showing the req data but in the section it is not displaying the joined class data.
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