Connecting to MQ using CCDT JSON from Websphere

I have IBM MQ running in one docker container and in another container I have IBM Websphere running. From Websphere I am trying to create QCF using CCDT connection method. I have copied CCDT file inside /tmp folder of Websphere container, when I test the connection I get the error:

A connection could not be made to IBM MQ for the following reason: JMSCMQ0001: IBM MQ call failed with compcode '2' ('MQCC_FAILED') reason '2278' ('MQRC_CLIENT_CONN_ERROR').*

I am able to connect from MQ Explorer using the same CCDT file.

CCDT JSON sample used:

{
     "channel":
          [
               {
                    "connectionManagement":
                    {
                         "sharingConversations": 10,
                         "defaultReconnect": "no",
                         "heartbeatInterval": 10,
                         "keepAliveInterval": -1
                },
                "general":
                {
                        "description": "Client Channel Definition",
                        "maximumMessageLength": 104857600
                },
                "name": "CHANNEL1",
                "clientConnection":
                {
                    "connection":
                    [
                        {
                            "host": "IP",
                            "port": port
                        }
                    ],
                "queueManager": "QMNAME"
                },
                "type": "clientConnection"
            }
          ]
}