ChatSetAttr question

I am looking to include character generation as a macro. Basically once the character is created in the journal and its token put on the vtt I want the player to be able to click a macro that will roll all of the stats for the character in one click. Now I have been using many of these APIs for over a year and thought I was getting quite competent in their use. But for some reason I can't get a roll value to work on chatsetattr. So if I were trying to set a character's weaponskill to 2d10+20 do do I code that in a macro using the chatsetattr API?

The inline roll should be a good example, along with the rest of the documentation: <a href="https://wiki.roll20.net/ChatSetAttr#Inline_roll_example" rel="nofollow">https://wiki.roll20.net/ChatSetAttr#Inline_roll_example</a> So maybe something like this: &amp;{template:default} {{name=Roll Character Stats}} !setattr --silent --charid @{target|character\_id} --weaponskill|-{{Weapon Skill set to =[[2d10+20]]}} --socialskill|{{Social=[[3d8+14]]}}!!!