There is no need to use the word "help" in your question title. That's what this forum is all about. So it's a bit redundant to add that. Also, there is no need to add punctuation at the end of the question title. Exclamation marks and questions marks do nothing to impact the speed or quality of the solution we provide.
Given the details you provided I really don't have a solution. I see that you want a chart label. And that you want the label to display a value. Something about the distance between your entry price and a moving average. You did not explain how this entry price is defined. So it's not possible to provide a solution.
After you explain that missing detail you will still need to explain how you want to compute this value. Is it the percent change from entry price to moving average? Or is it simply the distance between them expressed in dollar amount?