Why .Netcoreapp is not supported in Uipath?

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I have created a custom package in .Netcore library, While pushing the nuget pacakge into into uipath i am getting below exception. I can’t create the package in .net framework because 2captcha services are provided in .net core only. Does i need to install any package in UiPath?

NU1202: Package 2captcha-csharp 1.0.1 is not compatible with net461 (.NETFramework,Version=v4.6.1). Package 2captcha-csharp 1.0.1 supports: netcoreapp3.1 (.NETCoreApp,Version=v3.1)

Thanks in advance.