Why can't I find jsoncpp.lib in the WebRTC source code?

Question

WebRTC Native APIs

I downloaded the source code WebRTC.Normally there will be a file jsoncpp.lib in obj\third_party\jsoncpp\jsoncpp.lib but I can't find the file jsoncpp.lib on the code i downloaded.

The code I downloaded has the following structure: obj\third_party\jsoncpp\

1. There is 1 folder named jsoncpp(have 3 file .obj: json_reader.obj, json_value.obj, json_writer.obj)
2. And 2 file: jsoncpp.ninja, jsoncpp.stamp

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I didn't find jsoncpp.lib library file from webRTC so I downloaded jsoncpp library from jsoncpp homepage source code on GitHub but it didn't fix my error