Can i use airport express travel pass for tram services?

No, I am afraid you cannot use the pass to take the tram. 3 days unlimited travel pass doesn’t include tram services. As long as you top up the card, you can use it. As for the tram, do you refer to the tram leading to the Victoria Peak? If so, you can reload the pass with HKD50 around for the tram ride. If you want to use it on the bus or ferry, you can top up it according to your need.

And the round trip airport express pass has time limit, less than 14 days.