I'm afraid that is not possible as the AdWords API report needs a
report definition which is an XML or
AWQL fragment that defines the parameters of your report, including the report name, the types of information to include in the report, the download format, and other details. These report definition should be enclosed in an
HTTP POST Request which could be read by the AdWords server. For ease of use to the API, we highly recommend to use the
client libraries to download a report.
Let me know if you have further clarifications.