Importing variables into Storyline 360

2 things come to mind. 

As a .story is nothing more then a zipped folder with a lot of data and files in it. You can change the extension to .zip, unzip the complete package and edit parts of the content with any tool wanted. Zipping it back up and changing the .zip to .story and you have your working Storyline file again. Problem is though that Storyline is picky and its easy to make an error and then it wont work. I am gonna try it with a sample with some variables to see if i can find and change them within the unzipped folder. As this works, you could use any macro tool or scripted workflow to get things changed. 

Second possibility is using Javascript to read in values for your variables. As i donot know the exact setup of your project, this i cannot test. Here you see for example a post about global variables and how to get that working.
https://community.articulate.com/discussions/articulate-storyline/global-scope-for-javascript-variables-in-storyline

I did test the first option, and although i find the default Storyline variables as Slide.id etc. in the folder, i cannot find any trace of the custom variables i made as test. Probably those are encoded heavily and not to be found. So that option fails.