nftables element not in set

[Stephen Satchell <list@xxxxxxxxxxxx>]

As the documentation currently reads, you can use set expressions like this:

  tcp dport {22,8022} accept

Is there anything in the nftables syntax that permits detecting the 
absence of a match?  Something like

  tcp not dport {22,8022}

    or

  tcp dport not in  {22,8022}

All the examples and descriptions have netfilter only test for set 
union, not for set difference.

What am I missing here?