How can i send a different header id for every request with Artillery?

Question

I'm trying to send for instance 1000 concurrent requests with different request-id header for performance testing. API will notify if a request-id is duplicated, I'm facing Artillery will use same request-id for most requests. Is there any config param i should add so I can avoid this?

config:
  plugins:
    expect: {}
  phases:
    - duration: 1 # Phase duration in seconds
      arrivalRate: 1000  # Initial number of virtual requests per second
      name: Warn up
  ensure:
    maxErrorRate: 0
  defaults:
    headers:
      Content-Type: application/json
      request-id: "request-{{ $randomString() }}"

• I tried to pass a .csv file as payload to set headers but it seems is not possible for headers to use that value.

• I tried to concatenate random string and number but I face the same issue.