/usr/lib/pkgconfig/newtonsoft-json.pc is in libnewtonsoft-json-cil-dev 6.0.8+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
Name: Newtonsoft.Json
Description: A high-performance JSON framework for .NET
Version: 6.0.8+dfsg
Libs: -r:${libdir}/cli/Newtonsoft.Json-5.0/Newtonsoft.Json.dll
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