GPWS Radio Altitude callouts are airline dependent. In this airframe, the "20" callout is not enabled. However, since this is an airline option, I recommend you make it the same across all planes. This is because what's important is the cadence, and I'm more used to hearing all callouts upto "10". If one just skips, it can affect your muscle memory.
Click on the COMM button in the synoptics located on the FO side of the cockpit. You will get ACARS + METAR. Using Hoppie CPDLC, you can then request for PDC, airport METARs etc which will show up as messages on the ECAD display.
