Beta 2 is rolling out and includes support for the map and map quick appearance for select_one and select_one_from_file! See the post above for a description of how to try it out. There's a sample form with geojson above. This form is an example of an a select with map appearance and a set of locations defined directly in the form.
One thing we are interested in feedback on is performance. If anything feels slow to you, please let us know more about your scenario, the choices you want to load and the basemap you want to use.
More on the beta here. We are currently planning to release the week of August 11th.