PF How do I specify PF rules for IPv6 addresses w/a specific suffix?

The slash notation can be used in PF.CONF to specify a range of IPv6 address w/a given prefix, but how do I match only those w/a given suffix?

Basically, what I'm trying to do is specify outbound traffic blocking rules for a particular host that has a specific 64-bit IPv6 suffix, but whose 64-bit prefix has been assigned by SLAAC.
 
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