Linking groundtruth worker metadata back to the actual task?

Question

As far as I can tell there's no identifier being passed with the GT worker metadata (see below from documentation https://docs.aws.amazon.com/sagemaker/latest/dg/sms-data-output.html)? How would I link this information back to the actual labeling task?

sub I believe is a cognito reference to the worker, so not a unique identifier for the submisson. As of right now, I jsut know that one of the tasks took a certian amount of time for a particular worker, but I can't tell which one. I also guess i have to jump through a few hoops via cognito to get the GT worker id from the sub?

I am looking for a way to summarize origina data shown (from input manifest file), the label given, the time it took to complete. As of right now, I have to make one table that has the data with their human submitted label, and a separate table with time it took to complete by task, but no way to link the two...am I missing something?

here's the worker metadata json:

"submissionTime": "2020-12-28T18:59:58.321Z",
"acceptanceTime": "2020-12-28T18:59:15.191Z", 
"timeSpentInSeconds": 40.543,
"workerId": "a12b3cdefg4h5i67",
"workerMetadata": {
    "identityData": {
        "identityProviderType": "Cognito",
        "issuer": "https://cognito-idp.aws-region.amazonaws.com/aws-region_123456789",
        "sub": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"
    }
}