macro question concerning ChatSetAttr api script or anything else to lower an attribute by using a command

Hello all, I'm hoping that someone out there is familiar with this script. I am wanting to use this or another script to create a command that would lower an attribute such as strength by an amount.  My preference would be to be able to target a token and have a command to lower its strength by 1d4, or at least to be able to lower it by 2 if a roll is not possible.  Using ChatSetAttr, it seems only possible to set an attribute to a value.   !setattr --sel --Strength|15 Does anyone have any ideas? Thank you!

Try this; !setattr --sel&nbsp;--modb&nbsp;--Strength|-[[1d4]] (more info: <a href="https://github.com/roll20/roll20-api-scripts/blob/master/ChatSetAttr/README.md" rel="nofollow">https://github.com/roll20/roll20-api-scripts/blob/master/ChatSetAttr/README.md</a> )

Would it be helpful (or possible) to have Chatsetattr write the original strength score to a placeholder attribute, ex. "OriginalStrength", so that later you can use: !setattr --sel --Strength|OriginalStrength or similar (not sure of the syntax). That could be in a macro to restore the original value.

Thank you Vince!&nbsp; Works well. Keithcurtis that would be great.