When the Export menu is shown, click on it, and you will see an option to get the API request - I'm trying to gather as much as possible from the page, but I will revamp this feature and grab the underlying request (which isn't a straight GA API call, but does return a JSON structure which I should be able to use). I will likely make it possible to get a V3 or V4 request.
Thanks for the feedback! What I would like to try is something super simple - go on a Goal setup, do ctrl-c, then go where you want it, and paste it there (or something to that effect). I'm not 100% this will work - but I'll give it a try.
Fixed in Polymath 2018.4.17 - the GA UX was changed and the main reporting area is now an IFRAME. Adapted visibility rules accordingly.
Fixed in Polymath 2018.4.17
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