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Have you been able to export meta data from iCloud and import it into PhotoPrism? (e.g. custom photo comments)

I personally do not have any photo comments but I suppose the software can handle it. From https://github.com/RhetTbull/osxphotos#command-line-referenc... I think it will support exporting XMP metadata files with photo comments. Then from https://docs.photoprism.app/user-guide/use-cases/apple/ I think PhotoPrism will correctly import descriptions in XMP files.