Navigation step to a page with a parameter

I need to pass a string to a overview page and invoke the page from the navigation step.  I want to pass a constant value from navigation step as string parameter to an overview page and restrict the data in the overpayment if the type matches with the parameter string.     It seems , we can pass only objects to a page and wondering how to initiate a object form navigation steps ?  I could call a microflow from the navigation step and initialize an object, call a page. As the page takes only a object , what are the best options to implement this requirement?
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