How to set null value in wiremock standalone response template?

Question

I want to pass a null value in wiremock standalone from request to a jsonBody response, the problem that i faced is that the handle bars convert anything to string so my response is showing empty string ("") instead of null object (null).

Wiremock mapping file:

{
    "request": {
        "method": "POST",
        "urlPattern": "/(wapi|api/msp)/test/scenario",
        "cookies": {
            "x-mock-scenario": {
                "equalTo": "test-scenario"
            }
        },
        "bodyPatterns": [{
            "matchesJsonPath": {
                "expression": "$.operationName",
                "equalTo": "test"
            }
        }]
    },
    "response": {
        "transformers": ["response-template"],
        "transformerParameters": {
            "MyCustomParameter": null
        },
        "headers": {
            "Content-Type": "application/json"
        },
        "jsonBody": { "test": "{{jsonPath request.body '$.reversalDate'}}" }
    }
}

Request payload:

{
   "reversalDate": null
}

Expected result:

{
   "test": null
}

Actual result:

{
   "test": ""
}