(my previous reply-attempt seems to have disappeared, so...)
No, I can't. If I do F8 and Add Metadata, I don't see calibre:series and calibre:series_index at all.
I do, however, see Meta Element (primary). If I choose that, specify 1 as the meta value, and calibre:series_index as the property_name, the OPF-file entry looks oke.
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