Sorry, you seem to miss a few points about Debian packaging: First, there *cannot* be a dependency from Calibre onto unrar in any way, since unrar is not DFSG free. The unrar package is in the nonfree section.
And then, even if there is a dependency on unrar, this package (and no! package) ships the shared library necessary (libunrar.so).
There is already a bug report to unrar requesting inclusion of the shared library, but it has not been fixed by now, meaning that there is *no* libunrar.so available via standard Debian installation methods, including nonfree.
In absence of any reaction from the maintainer I will build a deb package of *only* libunrar.so and ship it in my calibre apt repository for those who want to use it.
All the best
Norbert
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