Add highlighter to Lucene.Net code

I need to add a highlighter to some [login to view URL] VB.Net code. The function works fine for everything else but I need to highlight the search terms in a JSON field that is parsed. I want to use [login to view URL] formatter for the highlighting. If you know where to add the lines of code then the project would be complete. I want to highlight the search terms that are in the Funding Opportunity Title and the Funding Opportunity Purpose