Is it possible to set subjectAltName using pyOpenSSL?

I need to generate SSL certificates from Python using pyOpenSSL. Does anyone know if it's possible to set subjectAltName? From the documentation (https://pythonhosted.org/pyOpenSSL/api/crypto.html#x509-objects) it doesn't seem so. In fact, only a set_subject method is provided. Is there any way to add that to the certificate?

What is subjectAltName Openssl?

subjectAltName specifies additional subject identities, but for host names (and everything else defined for subjectAltName) : subjectAltName must always be used (RFC 3280 4.2. 1.7, 1. paragraph). CN is only evaluated if subjectAltName is not present and only for compatibility with old, non-compliant software.

san_list = ["DNS:*.google.com", "DNS:google.ym"]
cert.add_extensions([
    OpenSSL.crypto.X509Extension(
        "subjectAltName", False, ", ".join(san_list)
   )
])