How to look up an ns cdev from block maj:min?

[Stefan Hajnoczi]

Hi,
Is there an official way for userspace to look up an ns cdev from a
block maj:min?

For example, how should a userspace program determine that /dev/ng0n1 is
the corresponding ns cdev when given just the block device node
/dev/nvme0n1?

Parsing the filename is an obvious option but it makes assumptions about
the naming convention of both the block device node and the character
device node.

Is there a better way via sysfs? (I couldn't find it.)

Thanks,
Stefan
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