One approach:

 

Use the Facets "Output Files" option to produce a Winsteps file.

Select the raters columns (items), and the relevant combinations of facets (e.g., examinees and tasks) as the rows.

This will produce a data file which can be used to produce inter-rater correlations in Excel.

 

If the inter-rater correlation computation is done in Winsteps,

In the Winsteps control file,

PRCOMP=Observation

ICORFILE=inter-rater-correlations.txt

Rasch estimates are not needed, so Ctrl+F soon after iteration starts.

inter-rater-correlations.txt contains a list of the inter-rater correlations based on the observations.