Dear Vanessa - I hope you are expecting a chart in this form, where the last (latest) data point you want to highlight. This can be done through Dual Axis. You need to create a calculated field through which you can identify the latest data points. The Calculated field should return NULL for all other time periods.
One example is following. The Following expression would always return NULL except the latest. Drag that into dual axis and color.
beautiful, thank you
My calc ran for a quarter with a running sum table cal so I had to change it slightly but your insight helped immensely
iif(DATEDIFF('day',ATTR([Emailed To FF Date]),TOTAL(max([Emailed To FF Date])))=0,RUNNING_SUM(sum([FF Rec Count])),null)