No more availability of we filed the GSTR returns... As per my view., Don't be worry if you can't show the HSN details in your Return Of you are filed Tax details correctly. File next returns carefully...
You mean HSN wise turnover? I think it's only for statistical purposes. Materially it doesn't affect, because you have paid the taxes correctly. Wait till last day, if you don't get any better advise, file it without that entry.