Subform with webhooks

I have setup a subform so that in the webhook integration I can post those fields as a sub-element in the JSON payload.

However, even if I only allow a single entry in the subform, Zoho always posts the subform as an array, but the webhook I am posting to needs it as a single object.

Is there any way to change this behavior?

For example, Instead of this format:

{
    "source" : "<SingleLine3>",
    "mainContact" : [
        {
            "firstName" : "<Name1.First>",
            "lastName" : "<Name1.Last>",
            "email" : "<Email1>",
            "phoneNumber" : "<PhoneNumber1>"
        }]
}

I need this format:

{
    "source" : "<SingleLine3>",
    "mainContact" : {
            "firstName" : "<Name1.First>",
            "lastName" : "<Name1.Last>",
            "email" : "<Email1>",
            "phoneNumber" : "<PhoneNumber1>"
        }
}

Notice that mainContact needs to be an object {} and not an array [{}]

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