In my case, I saved the approver name and their response to a SharePoint list and reference that later in my Flow. This is probably excessive but my users like to be able to pull up all "signatures" and make sure.
You could save the name, outcome, and approval date to variables in the flow and reference those. Assuming you have two approvals, you could have FirstApproverName, FirstApproverOutcome, FirstApproverDate, and then the same but SecondApprover, etc.