SSH comment parameter

Currently there is no opportunity for SSH format to add a comment like for the "corresponding" openSSH command:
ssh-keygen -t ed25519 -C "user@example.com" -N "MySecretPassword" -f id_ed25519_key

In the current version an SSH key is generated like that:

key_bytes = key.private_bytes(
    encoding=serialization.Encoding.PEM,
    format=serialization.PrivateFormat.OpenSSH,
    encryption_algorithm=serialization.BestAvailableEncryption("MySecretPassword".encode('utf-8')),
)

but there is no ssh_comment parameter to be used to add the "user@example.com" to the private key.

Ok, it is there a work around for the PUBLIC key appending the comment, but with SSH format is possible to "embed" the comment inside the private key directly.

Would be possible to implement that feature in the library?

Start by tracing the OpenSSH serialization path used by private_bytes with PrivateFormat.OpenSSH and inspect the related tests. Determine how an SSH comment can be represented in the private-key format, then verify that the proposed parameter embeds the requested comment while preserving encrypted key serialization.