Hi,

above field is a property of web part in which you can define a location, it is the same as longitude or latitude, i.e. only one field setting.

Maybe there is an easier solution for you. You could create another field in definition of your document type, which could be hidden by default so editor would not see it.

Then you could create a custom global event and update value of this field after document is saved, so you would create the address in one line using API. This field could be used in google map web part property (Location field).

How to create a global event you can find in this example

How to modify document field is described here:
document API

Best regards,
Ivana Tomanickova