In our Create Project Wizard the endpoints.MapControllers(); should be enabled by default, you could try and create a new project and if it still missing you can open a Support ticket so we can further investigate.
On the NewtonsoftJson framework, it is up to the application to define what third-party software products it will use.
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about the measures we are taking to ensure business continuity and help fight the COVID-19 pandemic.
Our thoughts here at Progress are with those affected by the outbreak.