How do I pass the dataset from the Results table to a custom workflow?

I’m trying to create a custom Export to XLSX option on the “Results Table Collection Actions” Context Menu:

I’ve created the beginnings of the workflow and created an input argument:

I also created the context menu item to run the RunWorkflowById command:

Where I get stuck is how do I pass the dataset from the Result table to the workflow? What do I assign as the value to be passed to the input parameter?