I don’t see why you need a seperate app / subscription for this. Claude does this very well, as do local VLMs such as InternVLM. They generate mermaid graphs which you can use directly or import to excalidraw.
I stopped offering to build custom demos for AGI pipelines last year because people just didn't get it. April Dunford's "Obviously Awesome" pretty simply covers why, because as very much not a product-person, I frequently fall prey to "if you build it, they will come" mentality.