Thanks for the reply. I am not speaking about hover value display when there exists a line/area map. Let me explain in more details.
Assume i have a stacked bar chart. It displays the value of each stacked component when hovered upon. However, i wish to see the total value of complete stacked bar. So this total value should come only upon hover but it shall not be displayed anywhere in chart. Or as an another example, assume i have a line chart which shows actual and forecast, however upon hovering i wish to the difference between my actual and forecast. So is this possible to achieve?