How to Have Invoice Submitter be an Approver in Workflow

I am setting up Invoice Approval Rules using the spreadsheet and would like the invoice submitter (the person who initiated the approval) to be included in the workflow.

For the first block, the invoice will route via job level hierarchy based on supplier type. For the second block, I’d like to send the invoice back to the original submitter. I’m not sure if this is possible or how it would be configured.

Can anyone advise?