I like to use Nintex forms because I really love how the cascading dropdowns work.  I was wondering, is it possible to connect to an external API (google api's with two-factor authentication) and pull the data to a list and use that list to create a Nintex form with cascading dropdowns and I get fresh data from the API whenever I use the form.

 

Is this possible?  If so, are there any resources that I can read and research?