Advice on extracting data from JSON stream

Question

I have a JSON data stream which contains a bunch of JSON objects prefixed with the 'Data: ' label. What is the simplest way to make this valid JSON so I can utilise the data stream in an application? The URL given is constantly updating so it has no end.

Short snippet of some of the streamed data:

data: {"value":12,"id":"window_doneTodayCount_1","updatedAt":1646316313574}

data: {"value":"4:30","id":"window_averageTime_1","updatedAt":1646316313596}

data: {"value":"Tue 11:05","id":"window_lastUpdatedTime","updatedAt":1646316313746}

I am looking to convert this dynamically to something like the below, which would be valid and I can use within an app:

[{
        "value": 12,
        "id": "window_doneTodayCount_1",
        "updatedAt": 1646316313574
    },
    {
        "value": "4:30",
        "id": "window_averageTime_1",
        "updatedAt": 1646316313596
    }, {
        "value": "Tue 11:05",
        "id": "window_lastUpdatedTime",
        "updatedAt": 1646316313746
    }
]

Not even sure if this is possible as I have never seen a file like this.

Thanks.