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I was showing you more "how I did it" than telling you the same driver, though the Realtek site should have one for you, just use it in this same way.

As for the re package in there already, it's an older driver without the "fix" for borking under load.  And as your's is a realtek chipset it might be the same issue.

Just thought it might work or point you in the right direction.   Cheers !

This is the link to the Latest Realtek drivers ,
https://freebsd.pkgs.org/14/freebsd-amd64/realtek-re-kmod-1100.00_1.pkg.html
I have the RTL8125B(G) x 3 on my N100 fanless install. 
I got this pkg file
https://pkg.freebsd.org/FreeBSD:14:amd64/latest/All/realtek-re-kmod-1100.00_1.pkg
download it to another system & put on a USB.

Then ,  put the usb in the other system and did :
# mount usb (in my case it was da0 device, first partition p1 = da0p1)
mkdir /mnt/usbstick
ls -l /dev/da0*
mount -t msdosfs /dev/da0p1 /mnt/usbstick

pkg add /mnt/usbstick/realtek-re-kmod-1100.00_1.pkg

Then unmount the usb
# usb unmount
umount /mnt/usbstick
rm -rf /mnt/usbstick

Now you have to tell it to load at boot :
Edit /boot/loader.conf.local     Add the 2 lines :
if_re_load="YES"
if_re_name="/boot/modules/if_re.ko"

Then reboot and Check:

reboot

Make sure the NIC is present here
ifconfig -a

now you should be able to find it in "Assign interfaces" or the Web-gui .

note:  if it doesn't DHCP an ip on  auto-negotiate ,  in the gui you can specify 2.5 g full duplex.  it has an issue with auto depending on what it's connected to. Mine was cable modem on wan, once changed worked faster than ever.

Hope this helps,  Cheers !