Creating External Monitors via AS3

I am trying to create an external monitor via AS3 using a script that exists as part of a gitlab project.

See: https://clouddocs.f5.com/products/extensions/f5-appsvcs-extension/latest/refguide/schema-reference.html#monitor-external

F5 provides an example here.

exert:

  "mNewExternalMonitorFile": {
    "class": "Monitor",
    "monitorType": "external",
    "interval": 5,
    "upInterval": 0,
    "timeUntilUp": 0,
    "timeout": 16,
    "expand": false,
    "script": {
      "url": "https://example.com/monitor.sh"
    },
    "environmentVariables": {
        "USER": "example"
    }
  }

I am able to do this exact thing with the url portion replaced with a local resource. However, I need to be able to provide authentication/authorization details to the resource.

There are other resources in AS3 that use the property Resource_URL. Unfortunately I can't use this because of the way Monitor_External is configured. 

Alternatively, is there a way for me to point to the local BigIP "/shared" directory and pull the script from there?