The attributes you are seeing are so called 'finder properties'. They are defined in vCenter plug-in as part of the mapping between vCO Javascript objects (host system, datastore, etc) and the 'real' vCenter object accessible through vCenter API.
This mapping is processed at compile time and I don't think the end users are able to change/configure them later without making manual modifications to vCenter plug-in binaries (in VSO-INF\vso.xml file, to be precise). Such changes are doable, but not documented and not officially supported.