I cannot tell you exactly what needs to be added because I don’t have any sites that use google maps. But I can tell you how to find what you want to know.
1) Edit a post and add a map
2) Examine your database wp_postmeta table and find the meta value for the field
This will tell you exactly what needs to be in that field.
From previous topics I know this is an array and that you must connect to the google map API to get the data for the address.
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