gistfile1.txt

{
"Type": "UnencryptedConfiguration",
"NetworkConfigurations": [
        {
        "GUID": "{guid1}",
        "Name": "foo",
        "Type": "VPN",
        "VPN": {
                "Type": "OpenVPN",
                "Host": "foo.myqnapcloud.com",
                "OpenVPN":
                        {
                        "ClientCertType": "None",
                        "CompLZO": "true",
                        "Cipher": "AES-128-CBC",
                        "NsCertType": "server",
                        "Port": 1194,
                        "Proto": "udp",
                        "SaveCredentials": true,
                        "ServerCARef": "{guid2}",
                        "Verb": "3",
                        "ServerPollTimeout": 360
                        }
                }
        }
        ],
"Certificates": [
{
"GUID": "{guid2}",
"Type": "Authority",
"X509": "-----BEGIN CERTIFICATE-----contents of ca.crt-----END CERTIFICATE-----"
}
]
}

guid1 and guid2 for L5, L20, L29.  L20 and L29 need to match.  They can be generated here:
https://www.uuidgenerator.net/
Cipher is medium security setting on QNAP
Change the names on L6 and L10 for your QNAP