What I did was go ahead and create the book in Sigil with the 'blank' TOC entries and then unzip the epub and manually edit the toc.ncx to add the labels.
Example from a book I just worked on (the red text was what I added later the rest came out of the epub from Sigil)...
Quote:
<navPoint id="navPoint-3" playOrder="3">
<navLabel>
<text>Chapter One</text>
</navLabel>
<content src="text/content008.xhtml"/>
</navPoint>
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