Move library from Newtonsoft.Json to System.Text.Json

Microsoft & many developers have been moving their apps & libraries from Newtsoft.Json to System.Text.Json recently (e.g. the Microsoft Graph SDK for .NET).
It would be very appreciated if this library could be moved as well. Not only is System.Text.Json faster and more efficient, it is also already used by many developers and libraries. Newtonsoft.Json isn't exactly the smallest .dll and increases the binaries of apps we are creating with the Dropbox SDK for .NET.