You can retrieve the Google place_id that has been set for each of your Fancy Fields.
ENDPOINT
GET
/rest/api/2/issue/{issue key}/properties/customfield_XXXXX-place_id
RESPONSE
{
"key": "customfield_10600-place_id",
"value": {
"place_id": "ChIJ1y0qPVGxQYgR2BZZZBTvquA"
}
}