Hello there.
I think you could use the Qlik API to get all the variables, here is a discussion that may help:
https://community.qlik.com/t5/Integration-Extension-APIs/How-to-extract-variable-list-from-a-Qlik-Se...
Besides that, I can only think of looking directly on the 'variables' menu, on the bottom left of the edition screen, or creating a manual table in the script, something like:
Variables_table:
LOAD * INLINE [
Variable, Formula
A, Sum(A)
B, Count(B)
...
];
