WFA does not have cluster/vserver peer data cached in its database, since this data is not collected by OCUM as well.
Also vserver comments are not reflecting in WFA cache, since this data too is not collected by OCUM.
In order to use this data in filters, you will have to cache the data in WFA db.
This could be done by creating a custom data source type that could acquire the data you require from the cluster and place it in the playground database.
Once this data is cached, a filter could be written to fetch you the details you require.