Can't set DSCP priority on my nftable

vi /etc/nftables.conf
//

table inet my_mangle_table {
    chain my_output_chain {
        type filter hook output priority mangle \; policy accept;

        udp dport { 3074, 3478, 4379-4380, 6112-6119, 20500, 20510, 27000-27031, 27036, 28960 } dscp set 46
    }
}

//

i can save, but im unable to apply it. i need help

No need for a custom table/rule.
You can create the rule using uci/luci.

config rule
        option name 'My_DSCP_rule'
        list proto 'udp'
        option dest '*'
        option dest_port '3074 3478 4379-4380' # List all ports
        option target 'DSCP'
        option set_dscp 'EF'
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