The described technologies are supported by Telerik Reporting. The only component which we have not tested is the Google Cloud App Engine. I do not see any limitations of the engine such as limited GDI+ support, so it should be possible to use it. About the .NET framework requirements, the client application containing the report viewer can use a wide range of technologies and frameworks (Angular, ASP.NET, HTML5/JS), while the Telerik Reporting REST service which renders the reports should be hosted under the full .NET Framework.
My recommendation is to download a trial Telerik Reporting
and test a sample app with the described configuration.
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