Increasing HP with level (Dwarven toughness)

Using the 5e OGL character sheet, I'm trying to do this - under the attributes and abilities tab, I'm setting max hp to (10+@{level}). However, it doesn't parse the formula and just displays the formula on the main sheet. What am I doing wrong?

I believe that's intended behavior.  The Hit Points Maximum field on the sheet and the hp|max from the attributes and abilities tab will always match. The rendered total for hp|max exists, but the sheet isn't setup to show you the total.  This would require one field to enter the formula and another to display the result.  If you link hp to a token bar, the parsed total for hp|max will be seen on the token's properties and properly represnted with the status bar.

Thanks!