I am trying to find a list of trading session definitions for a specific instrument (at least the currently active ones). Is there some API I can use to retrieve that information?
TBH this sounds like a content question - rather than an API question.
Please read this post on Trading status and if it does not help or you need more guidance, then I recommend you raise a Content-type ticket with MyRefinitiv. If you do raise a ticket, please provide details of the exchange/market region/asset classes etc you are interested - so they can provide the most relevant information.