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Dear Sir:

Lightroom keeps ratings and labels in an internal database. For Capture One / FastRawViewer to see those, you need to export metadata from Lightroom. Lightroom will record XMP sidecar files that other applications can read, that's the standard exchange mechanism.

Here is one way to do that. In Lightroom, Library mode, and for example while in Grid view:

  • click on "All Photographs" under "Catalog"; 
  • "Select All" (Ctrl-A or Cmd-A, if on OS X)
  • right-click on an image, from the drop-down go to Metadata and to "Save Metadata to Files"

If metadata is changed outside Lightroom, but the images are already imported into Lightroom catalogue, you can re-sync metadata through "Read Metadata from Files".