How do I update multiple document properties with REST API POST method?

I'm trying to use the REST API to update possibly multiple properties of a document at the same time using the POST method to the endpoint

/objects/0/10741/latest/properties

According to the documentation and the Github Postman sample collection, the request format should be

[
    {
        "PropertyDef": {{PropertyDefID}},
        "TypedValue": {
            "DataType": {{DataType}},
            "Value": "KeywordTest"
        }
    }
]
But when I try sending this to the properties endpoint, I get an error:

Request:
POST /objects/0/10741/latest/properties
[
    {
      "PropertyDef": 1034,
      "TypedValue": {
        "DataType": 5,
        "Value": "2024-06-18T00:00:00Z"
    }
]
Response:
{
    "Status": 400,
    "URL": "/objects/0/10741/latest/properties",
    "Method": "POST",
    "Exception": {
        "Name": "ArgumentException",
        "Message": "Malformed data.",
        "InnerException": {
            "Name": "JsonReaderException",
            "Message": "JsonToken EndArray is not valid for closing JsonType Object. Path '[0]', line 8, position 1.",
            "StackText": "Error reference ID: adfc2ada-f967-4476-aded-74e2b82afb43"
        }
    },
    "Stack": "Error reference ID: adfc2ada-f967-4476-aded-74e2b82afb43",
    "Message": "Malformed data.",
    "IsLoggedToVault": true,
    "IsLoggedToApplication": true,
    "ExceptionName": "ArgumentException"
}

How should the request for update properties with POST be formatted for it to work?