ASP.NET Core 6 and IAsyncEnumerable - Async Streamed JSON vs NDJSON

Recently I've published code and written posts about working with asynchronous streaming data sources over HTTP using NDJSON. One of the follow-up questions I've received was how does it relate to async streaming coming in ASP.NET Core 6. As the answer isn't obvious, I've decided to describe the subject in more detail.