Split a port to a separate network

Installing and Using OpenWrt Network and Wireless Configuration
1

I have ASUS TUF-AX4200 and I'd like to have a separate network (DHCP, NAT) on LAN4. How do I do this?

"kernel": "5.15.137",
	"hostname": "p",
	"system": "ARMv8 Processor rev 4",
	"model": "ASUS TUF-AX4200",
	"board_name": "asus,tuf-ax4200",
	"rootfs_type": "squashfs",
	"release": {
		"distribution": "OpenWrt",
		"version": "23.05.2",
		"revision": "r23630-842932a63d",
		"target": "mediatek/filogic",
		"description": "OpenWrt 23.05.2 r23630-842932a63d"
	}

ls -l /sys/class/net
lrwxrwxrwx    1 root     root             0 Aug  5 23:44 br-lan -> ../../devices/virtual/net/br-lan/
lrwxrwxrwx    1 root     root             0 Jan  1  1970 eth0 -> ../../devices/platform/soc/15100000.ethernet/net/eth0/
lrwxrwxrwx    1 root     root             0 Jan  1  1970 eth1 -> ../../devices/platform/soc/15100000.ethernet/net/eth1/
lrwxrwxrwx    1 root     root             0 Jan  1  1970 lan1 -> ../../devices/platform/soc/15100000.ethernet/mdio_bus/mdio-bus/mdio-bus:1f/net/lan1/
lrwxrwxrwx    1 root     root             0 Jan  1  1970 lan2
...
lan3
lan4

It seems that https://openwrt.org/docs/guide-user/network/vlan/switch_configuration is a bit outdated.

config device
	option name 'br-lan'
	option type 'bridge'
	list ports 'lan1'
	list ports 'lan2'
	list ports 'lan3'
	list ports 'lan4'
2

https://openwrt.org/docs/guide-user/network/dsa/dsa-mini-tutorial#multiple_networks_using_vlans

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