Is it possible to add error bound range into Google sheets?

I just learnt how to make chart in Google sheets by this tutorial:

https://business.tutsplus.com/tutorials/how-to-make-professional-charts-in-google-sheets--cms-28453

And my data is:

Month   Expense
January 1900.5
February 1894.5
March.   1700

I was wondering if we could include the error bound range in the charts it can clearly help indicate that we are in or out of variance for each month?

For example, the original chart:

And I'd like to set 5% around the previous largest/smallest expense as the error bound range, to indicate the March is out of the range: