Expert Power BI Report to Excel programatically (or CSV .. Not from the Desktop nor Powerbi.com)

We have embedded Power BI in our React Application and can be able to perform Copy reports, Move reports from one work-space to other and edit reports using Power BI Rest APIs. But here we are facing one issue, We could not able to export power BI report as PDF / Excel using any of the API. Is there any solution(Except Power BI Desktop) that we can able to export power BI Report to PDF / Excel using C#?

Could anyone please provide any suggestion/Solution to export reports to PDF/Excel or Both.

There is a tool called PBRS, how does export is working in that tool, because we are unable to find any API for the export report to EXCEL or CSV.