Is there a way to highlight event frames along with a trend which will give more visibility for the EF?
Are you asking if it's possible to have Event Frame data in trends along side other Event Frames? This is possible in PI Vision 2017:
OSIsoft: View and Compare Related Event Frames in PI Coresight 2016 [v188.8.131.52] - YouTube
I'm not sure I understood your question. Is this what you are looking for?
Retrieving data ...