Are you looking for one single axis for both Latest and Future test dates? Also are you looking one visual sitting on top of the other?
Could you please attach a workbook in twbx format
I think the end result is to show year to date tests and future tests that are year to date that in one visual. (not sitting on top of one another.) If this is possible. The customer is trying to keep on top of compliance and needs to see what else is out there so that they can schedule resources accordingly and ensure they test everything by end of the year.