Requested feature from the twitter-community, three different modes:
Mode 1: The closing time is taken from the CME futures contract but the price is taken from the current symbol
Mode 2: The closing price is obtained directly from the CME Futures contract CME:BTC1!.
Mode 3: Instead of the closing price, the settlement price is directly obtained from CME:BTC1!
Please note that modes 2 and 3 may not give you the expected result, since there are price differences in spot and futures prices. Mode 1 is the default.