There are some ebook formats that do not save anything other than standard (DC??) metadata...at least that goes through Calibre. IIRC mobi is one of those. I have seen some books use workarounds by putting the non-standard metadata in between remarks codes... As Jellby said, it is still up to the device/app as to weather it will read that metadata.
Quote:
<!--
<meta content="1" name="calibre:series_index" />
<meta content="Howdy" name="calibre:series" />
-->
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...of course you could always switch to ePub format...