Additional attribute for Tooltips and multidimensional word list

Thanks for the great plugin! I use it in order to recognize the input of certain words with a list of words from a Database. I would like to expand the highlighted entries with tooltips to describe these Words.

Here is my question:

Where I should start in order to support multidimensional arrays so that I can attach a additional attribute which I can use to explain the highlightet words with tooltips?

Best Regards!