Is there a way to generate a variable using the contents of another variable? (Harlowe)

I'm trying to create a variable using the contents of a previously existing variable. So in theory:

(set $num to "$var")
(set (print: $num) to "string")

...would give me a variable $var containing the string "string". Except that doesn't work.

Is there any way to set this up to dynamically create new variables without me explicitly authoring every single one of them? Thank you!