I found some that do the opposite, take digital writing and format into a printed list.
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So you say “programs like Trilium”. Have you looked at Joplin?
Joplin comes with OCR albeit for search only. I myself have not tried it yet, but Joplin itself is a great note app.
Also Joplin seems to have an in development plugin for extracting text via OCR.
Maybe you can then export it to Trilium, if this a one time thing.
I don’t know if you’re into this, but this would be a perfect project to learn a new language or framework.