Is there any way to update the freemarker engine in NS?

Not possible. Anything under the hood is all managed by NetSuite

Thanks @Akira. Do you know how to parse a string to hash in freemarker? I'm using the eval function but its throw errors.

No experience there. Maybe try the #C29HQS63G channel? Most script related topics are covered in there.

#C466X49JB is probably more help for this specific query

Thanks, @Akira and @Jon Kears