If you are using DND 5e, or a compatible system, then you can display modifiers that are automatically calculated from other numbers (e.g. the strength, dex, etc. modifiers).
mod5e(value=fieldname[,show_symbol,dice=dice notation,dicelabel=dice label text])
| value | Required | The name of a number() value to display the modifier for. |
show_symbol | Optional | If included, the number will be shown with a + symbol before it for any positive number (and 0). |
| dice | Optional | Makes this number able to roll digital dice, defined by the standard dice notation here. See Digital Dice Rolling: Dice Notation for more information. |
| dicelabel | Optional | If dice is specified, specifies the title on the dice notification. |