Call a Axapta function in Dynamics AX Reporting Project(Visual Studio)

After installing Reporting Extensions, I can edit in Visual Studio Standard Axapta reports located on AOS\Report Libraries.

These reports are deployed to Report Server. I created a new report and this report uses one query created on Axapta.

The question is how I can use axapta functions in this type of report?

The report extension is moxl.