vyos@vyos# set firewall ipv6-name FOO rule 10 hop-limit 
Possible completions:
   eq           Value to match a hop limit equal to it
   gt           Value to match a hop limit greater than or equal to it
   lt           Value to match a hop limit less than or equal to it

      
[edit]
vyos@vyos# set firewall ipv6-name FOO rule 10 hop-limit gt 10
[edit]
vyos@vyos# set firewall ipv6-name FOO rule 10 action accept 
[edit]
vyos@vyos# commit
[edit]
vyos@vyos# sudo nft list chain ip6 filter NAME6_FOO
table ip6 filter {
        chain NAME6_FOO {
                ip6 hoplimit > 10 counter packets 0 bytes 0 return comment "FOO-10"
                counter packets 0 bytes 0 return comment "FOO default-action accept"
        }
}

vyos@vyos# set firewall name FOO rule 10 
Possible completions:
   action       Rule action [REQUIRED]
   description  Description
 > destination  Destination parameters
   disable      Option to disable firewall rule
 > fragment     IP fragment match
 > icmp         ICMP type and code information
 > ipsec        Inbound IPsec packets
 > limit        Rate limit using a token bucket filter
   log          Option to log packets matching rule
   protocol     Protocol to match (protocol name, number, or "all")
 > recent       Parameters for matching recently seen sources
 > source       Source parameters
 > state        Session state
 > tcp          TCP flags to match
 > time         Time to match rule