Zyxel NBG6817 external overlay rootfs on /dev/mmcblk0p10 with OpenWrt 21.02.3?

I have Zyxel NBG6817 and flashed openwrt-21.02.3-ipq806x-generic-zyxel_nbg6817-squashfs-factory.bin via stock firmware.
All was flashed ok except there is small size rootfs and there is quite big and free /dev/mmcblk0p10 for about 3 Gb.
Is it possible to engaged it for external overlay ?
Are there all ncesessary pactehs built in to OWRT 21.02.3 ?

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I'm in the same boat and all the info I could find was Zyxel Armor Z2 (NBG6817) - 3GB extroot on 19.07 - #14 by no02

I could build OpenWrt in my own that would allow me to use 3Gb partition as external overlay.

I also use unifi hd, I want to use 256mb emmc space. Does the same method here also work on this device?