I have no clue how to get the widget to work because I never tried it, but here’s what I did to get a Google map on my page (and you might try it in the meantime, until you get an official answer):

Go to Google Maps and enter the address and pull up the map. Click the link icon (next to the printer icon) and get the embed code. Then, in Flexform, create a text box. Paste your embed code in the text editor. Save, update, and you should have your map pointing at your intended target.

Red