Primefaces data export for nested datatables and dynamic columns

I have an outer DataTable that has only one column, and each row is a sub DataTable. The number of sub data tables varies based on number of elements of the list that is accepted from the outer database. In the sub datatables i use dynamic columns. I need to export the data that appears to pdf/excel. The primefaces exporter doesnt support nested datatables. i've seen this answer but it provides no answer to the dynamic columns issue: Primefaces dataExporter and nested dataTable Any help is welcomed, cause im on a tight deadline.