Dataset values to a percentage

I have a chart dataset that is giving me "DurationOn" for an 8hr period for 14days. how do I display that same data at a percentage of time instead of a value? for instance... my data set for 9.12.23 for the 2PM shift shows 15968sec On.. I want it to show 0.554444 (15968/28800).

Is there an easy way to do this?

Vision or Perspective? Add the relevant tag (using the dropdowns under the question title when edited).

If Perspective is the dataset coming from a property binding or what?