Hello.
Just reporting that I installed a second 2.5 Gbe ethernet port using this card:
https://de.aliexpress.com/item/1005004171201464.html?spm=a2g0o.order_list.order_list_main.22.21ef5c5fSfEOYP&gatewayAdapt=glo2deu
no driver necessary - detected and working right away.
Idle power draw up from: 3,2 to 4 W. (nvme ssd + ethernet card installed)
running: Armbian 23.02.2 Jammy with Linux 5.10.110-rockchip-rk3588