Convert IWA to CSV

IWA archives found as pat of the files of various iWorks documents (.pages, .numbers etc.) typically just contain settings and metadata and not the actual document data, which means it is unlikely that you can export and save any data from it to CSV format.

Simply put, it is impossible to convert IWA to CSV directly.
Thus, there is no so-called iwa to csv converter or a free online .iwa to .csv converter to be found.