Append a Value to a Pen Name in Easy Chart

I’d like to append the tag value to the pen name in an easy chart. I’ve done this by cell binding and I’ve got it to work, but the number is too precise. I’d like to only show to one decimal place.
As you can see from the screen shot the BRM Temp is to 4 decimal places and the Office Temp is to 5 decimal places.

How do I place number formatting to the tag value when its added to the pen name?

If you make a custom property with the string data type you can bind that to an expression and use the numberFormat function.

numberFormat({BRM Temp}, "#,##0.#")