Batch job tags don't show up everywhere

I found a way to do solve my (EventBridge) problem using AWS Batch's parameters option for jobs.

This is a way to write an EventBridge rule that matches a specific parameter set for filtering purposes

{
  "source": ["aws.batch"],
  "detail-type": ["Batch Job State Change"],
  "detail": {
    "parameters": {
      "match_me_exactly": ["only-this-should-match"]
    }
  }
}

This will filter down to job state events that come from a job submitted like so

batch_client.submit_job(
  # other stuff here ...
  parameters={"match_me_exactly": "only-this-should-match"}
)

Other types of content matching can be figured out from EventBridge's docs https://docs.aws.amazon.com/eventbridge/latest/userguide/eb-event-patterns-content-based-filtering.html#eb-filtering-complex-example