Comment by mgr86
Understandable. I work in academic publishing, and while the XML is everywhere crowd is graying, retiring, or even dying :( it still remains an excellent option for document markup. Additionally, a lot of government data produced in the US and EU make heavy use of XML technologies. I imagine they could be an interested consumer of Nanonets-OCR. TEI could be a good choice as well tested and developed conversions exist to other popular, less structured, formats.
Do check out MyST Markdown (https://mystmd.org)! Academic publishing is a space that MyST is being used, such as https://www.elementalmicroscopy.com/ via Curvenote.
(I'm a MyST contributor)