我收到消息了

nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.

内核是5.4.23，nftables版本是0.9.3。我如何为那个ct状态分配一个helper？

table ip filter {
        chain input {
                type filter hook input priority filter; policy accept;
                ct state established,related accept
                iif "lo" accept
        }
        chain forward {
                type filter hook forward priority filter; policy accept;
        }
        chain output {
                type filter hook output priority filter; policy accept;
        }
}