How to insert JavaScript to Power BI Report Server

I need to insert my own JavaScript to Power BI Report Server page at:

http://server/reports/browse/

I know, that it is possible at report viewer page by editing this file:

C:\Program Files\Microsoft SQL Server\MSRS13.MSSQLSERVER\Reporting Services\ReportServer\Pages\ReportViewer.aspx

I need to customize this:

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