Thanks David for your reply. I am currently using default form creation from Adobe Campaign under online \web application, please see the workflow below. I added the JS script activity and try to pass the language field = "EN" to the recipient table, it didn't work.

Could you please take a look at the code below and let me know if there is any workaround?
var language = "EN";
xtk.session.Write(<myschema xtkschema="cus:receipient"
language={ctx.vars.language}
/>);
Thanks,
ED