The OVA URL can accept the FTP path. For reference, see the following sample input json.

Note:

The FTP user password is in the plain text. If your FTP server supports, you can also use ftp anonymous user.

{    
      "tcaMgr": {        
            "name": "TCA Manager",        
            "vmEndpoint": "1.2.3.4",        
            "ovaUrl": "ftp://<ftp-user>:<password>@<ftp-server-IP>/VMware-Telco-Cloud-Automation-3.1.0-22803370.ova",        
            ...    

       }
}