Wikidata already represents more granular information than an article, the real problem is that the only way that we have to bind a piece of information in Wikipedia to its Wikidata representation is through the article name.

This is of course derived from the technological limitations of mediawiki which treats each article as a blob of text.

On Wikisource we use Labeled Section Transclusion to define regions of a mediawiki page that can be transcluded into other pages:
https://www.mediawiki.org/wiki/Extension:Labeled_Section_Transclusion

It is normally used with the following format:

## stable_section_identifier ##

some text here

####

In a way, it is like creating a local variable, since you assign an identifier to a section that later on can be referred to regardless of the changes in the text or in the title. I wonder if this is something that could be adapted for Wikipedia in a way that users could mark article sections with unique identifiers and then link those stable section identifiers in Wikidata.

Cheers,

Micru