I don't think so, because an MBR/GPT OpenBSD partition is not a filesystem. It's a collection of one or more filesystems, managed via a disklabel. On the six or so MBR (or GPT) architectures, there are two distinct layers of partitioning. On the 11 or so non-MBR architectures, there is only a single layer of partitioning.
Virtual disklabels are allocated only to recognized foreign filesystems (FAT, ext, NTFS, CD9660, ...).
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