Single Custom X-Axis Label (Date) in Excel Chart

[sam007]

I'm trying to edit a single label on the X-axis of my Excel chart. I have a simple time series chart with date labels on the x-axis. I have chosen a single letter for the month. I want to edit the first month of the year (J) only and change it to 2020. The next label should remain F.

I attached a screenshot of what the X-axis labels should look like. With one label the year and the rest of the labels the month.