Using SetValue() for java script value

Hi Team,

I would like to set a value in my merge field dynamically could you please provide me some assistance for the same.

For example,

 var x =1;

x is my dynamic value and would like to set its value in my merge field I am being able to set static value as below:

 [%SetValue(mymergefield, 1) %]

However would like to set value dynamically as below:

 [%SetValue(mymergefield, x) %]

Regards,
Samarth