Vault PKI: certificates with multiple CNs (LDAP)

Hi every one.

I have been using Vault PKI storage engines for few years now, have multiple CAs there and works like a charm.
I run into OpenLDAP usecase where ldap needs for communications certificates with multiple CNs in Subject.

Example:

Certificate Request:
Data:
Version: 1 (0x0)
Subject: CN = auth, CN = external, CN = administrative, CN = replicator

Is there any way, how to issue certificate with this subject ?
I tried using standard issue/ api or sign/ api providing CSR but I always get only one CN in the certificate.

I know it’s not standard usecase, I’m not sure why LDAP needs souch certificates and does not support SubjectAltNames.