Integrate OKTA Authentication in SSRS

Hi All,
I am looking for implementing the Custom authentication for SSRS reporting server using OKTA authentication. My requirement is to authenticate using OKTA in SSRS. I am struggling to call the OKTA code in console / C# library, as the OKTA is supported only in ASP.NET, MVC and .NET core, but my goal is to create custom security extension to call OKTA for authenticate?

Please suggest.