Models for key value pair extraction in NLP

There are a range of models, articles and information available which extract keywords from unstructured documents. Examples are Spacy, POS tagging, NER, entity extraction etc

What I am looking for is key value pair extraction and not able to find much relevant articles or models or even datasets. Few examples of key value pairs are:

Name : Sandeep

Company Name: Sandeep

Total Amount $10000

Invoice INV110011

or INV | INV110011

There can be a range of formats in which key value pairs can come. In above examples, person name and company name is same, and without much context models like spacy etc get confused.

Can someone please point to some models or information or articles or datasets which are trying to extract this information.