Automatically create links

[astrodad]

Hello all,

I am converting some historical documents in HTML within which are lines alike this:


they have lost the power of
discriminating between the true and the false."[2]

The [2] points to an element at the bottom of the document:

<li>2. Encyclical letter &quot;Arcanum,&quot; 10 February 1880. </li>

I could write a program to automatically parse these while still in HTML using something like Beautiful Soup, but can anyone think of a trick in Calibre that will automatically create a link from the [2] to the footnote <li> element?