I'm working on a lambda that processes DocuSign webhook payloads, which always have a top-level "event" property:

{
    "event": "envelope-completed",
    "apiVersion": "v2.1",
    "uri": "/restapi/v2.1/accounts/...",
    "retryCount": 0,
    // ...
}

The problem is that lambda-local sees the "event" property, and instead of wrapping the entire payload as the body of a simulated API Gateway event, the entire value of the event parameter passed to my lambda function becomes "envelope-completed".

Is there any way to get lambda-local to ignore the "event" property in the payload and just process it like normal? Maybe a command-line flag? I don't have any control over the format of the JSON I need my lambda to process.