I'm trying to create certificates with ‘oid:1.2.3.4.5.5’ for use with https://floragunn.com/searchguard/. Following their keytool example in https://github.com/floragunncom/search-guard-ssl/blob/5cd934e076a1273b21d8db0fec0e60e9207eada7/example-pki-scripts/gen_node_cert.sh#L37 I end ut with a certificate with the following (not including hosts and IPs):

    X509v3 extensions:
        X509v3 Subject Alternative Name: 
            Registered ID:1.2.3.4.5.5

How can I achieve this with Cfssl?