I think you may be referring to the concept of KWIC [1], "Keyword in Context", which has been used in text-based indexes for publications for quite some time.

I think you may be referring to the concept of KWIC [1], "Keyword in Context", which has been used in text-based indexes for publications for quite some time. [1] https://en.wikipedia.org/wiki/Key_Word_in_Context https://en.wikipedia.org/wiki/Key_Word_in_Context