DocLLM and similar framework - LLMs on semi-structured docs (invoices,etc)

Was looking at the best frameworks in semi-structured documents.
GPTs are good at plain text, but things like orders, invoices, etc are more challenging.
I’ve seen that JPMorgan did a paper DocLLM but I haven’t seen it released as open source.
Was wondering if anyone has been working on this or knows any framework/github/paper