A dump for enwiki has been extracted to https://datasets.wikimedia.org/public-datasets/enwiki/article_quality/wp10-scores-enwiki-20160820.tsv.bz2 with all the necessary information to add a new factor to cirrus document.
We could use this data with a small tool to augment cirrus dumps before indexing into relforge.
The score itself ranges between 0 and 5.