'"application/json" constant in .NET framework

I've just declared a constant for the "application/json" content type in one of my classes.

public const string JsonContentType = "application/json";

I'm not sure it is a good practice.

Does .NET framework have a predefined const for "application/json"?

Solution 1:^[1]

In order to add an up-to-date answer: since dotnet core 2.1 MediaTypeNames.Application.Json has been defined.

There is now for Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6...

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Solution	Source
Solution 1	Bob Van de Vijver
Solution 2	Mick