[Python] Azure Runbooks - Parse Python Params

I have a runbook and I am trying to basically parse parameters I entering into the body of the POST request (using Postman). I looked at this thread, but couldn't get it to work.

My runbook's code where I am trying to get the params:

mode = str(sys.argv[1])
resource_group_name = str(sys.argv[2])
vm_name = str(sys.argv[3])


here's my Postman call:

Error message:

in raw_decode obj, end = self.scan_once(s, idx)ValueError: Expecting property name: line 1 column 2 (char 1)
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