Yes Phaneendra is right you have to add it to your raw data manually, what I can suggest you , download any source table which has Lat and Long values for city and apply vlookup , So you donot need to add values for every record manually.
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You can try to loop over the address and call the Google API.
LOAD '$(vID)' AS ID,
[result/geometry/location/lat] as lat,
[result/geometry/location/lng] as lng,
FROM [http://maps.googleapis.com/maps/api/geocode/xml?address=$(vAddress)] (XmlSimple, Table is [GeocodeResponse]);