Setting Results1.ScorePercent to equal a user-defined variable

I need to adjust or set the built in storyline variable.  I wish to set %Results1.ScorePercent% to be equal to a variable that I have created to show the results of a custom simulation exercise.  I was hoping to execute a JavaScript expression to set %Results1.ScorePercent% to be equal to my variable.

I tried the following as my custom variable is caller “score” with no luck.

var Results1.ScorePercent = score

Any advice is appreciated.  I know how to override the results displayed on the slide.  However, I want my custom score % to be submitted to the LMS with the "Submit" trigger.