No, I didn't - but that looks to be a very limited thing anyway, just for the single book view (on first glance).
Ideally, there would be a standard way of querying the calibre db (GraphQL perhaps?) for objects (i.e. books, series, authors etc) - and then each of those objects would have the appropriate meta fields available....and the templating system would not impose any structure/nav etc on the project at all. (Basically, like say Craft CMS and other modern CMSs do it, but with Calibre as the back end).
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