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I worked at a place where we developed a system for doing this kind of tagging but it was for making training sets and there was no expectation that you could export the document from the system for normal use.
Quite a few NLP annotation systems are out there
https://prodi.gy/
https://brat.nlplab.org/
https://doccano.herokuapp.com/
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Hence, a higher number means a more popular project.