useInfiniteQuery and data mutaion

[sm2017]

As far as I understand useInfiniteQuery append or perpend new data to existing data, and queryFn MUST return array

I have a use case that I don't want simply append or perpend , I want to append and remove duplicated , How can I do it in react query , I think it is not possible

My second question is , is it possible that queryFn returns object? my object has result array with additional properties