Based on what I see in Heap's documentation (https://heapanalytics.com/docs/define-events#events) it appears that you would set events on your end via Heap's panel for the pages and elements you're looking to track. I'd recommend on top of that you have your developer wire a setup so that Optimizely fires something into Heap letting it know if a certain page belongs to an experiment or non-experiment version of it.
