Using IngestionPipeline for content not originating from the file system

[f2bo]

I'm beginning to look at Microsoft.Extensions.DataIngestion pipelines. As a test, I considered using an IngestionPipeline to ingest content stored in a CMS SQL database and create a vector store for use with RAG. However, I'm unclear on how to implement it when the data to be ingested is stored in a database.

Currently, both overloads of the ProcessAsync method require file system objects.

https://github.com/dotnet/extensions/blob/15ffd76a9ed12213f9299c9b94ccf2f86eea1b62/src/Libraries/Microsoft.Extensions.DataIngestion/IngestionPipeline.cs#L80-L81

and

https://github.com/dotnet/extensions/blob/15ffd76a9ed12213f9299c9b94ccf2f86eea1b62/src/Libraries/Microsoft.Extensions.DataIngestion/IngestionPipeline.cs#L107-L108

Perhaps I misunderstand its purpose or how it's meant to be used, but it would appear that it can only ingest data originating from files. Is that the case?