Hi @Shashank Gowda
As far as I know, the ReportViewer apply to the ASP.NET 4.x (.NET Framework) webform application, it doesn't apply to the .NET application (.NET Core 1.0 - 3.1, .NET 5, and later versions of .NET). The difference between .NET and .NET Framework, see Choose between ASP.NET 4.x and ASP.NET Core.
In asp.net core application, to display the SSRS reports, you can create a .NET Framework application and use a webform to display the report, then in the asp.net core application, use an Iframe tag or send http request to call the web page and get the report. Besides, you can also search some third-party package, perhaps they can help to display the SSRS reports in the asp.net core application.
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Best regards,
Dillion