Pass in environment variables to OpenTelemetryCollector config

I have installed an OT Operator for Kubernetes, I now need to create an OT collector instance to start collecting and reporting metrics. The example on the page is super simple

apiVersion: opentelemetry.io/v1alpha1
kind: OpenTelemetryCollector
metadata:
  name: simplest
spec:
  config: |
    receivers:
      otlp:
        protocols:
          grpc:
          http:
    processors:

    exporters:
      logging:

    service:
      pipelines:
        traces:
          receivers: [otlp]
          processors: []
          exporters: [logging]

However my config has a bit more to it and requires an api key which I would like to pass in as an env variable. Is there anyway to do that?

apiVersion: opentelemetry.io/v1alpha1
kind: OpenTelemetryCollector
metadata:
  name: simplest
spec:
  config: |
    receivers:
      otlp:
        protocols:
          grpc:
          http:
    processors:

    exporters:
      logging:
      otlp:
        endpoint: $ENDPOINT
        headers:
          api-key: $API_KEY

    service:
      pipelines:
        traces:
          receivers: [otlp]
          processors: []
          exporters: [logging]