Please try TrueNAS CORE 12.0-U6, it should include the driver for that NIC.
Is there any way to get this NIC working? I have Intel NUC8i5BEH with Intel I219-V NIC.
I know that NUC is suboptimal setup, but it is what I got for now...
I am not familiar with TrueNAS or FreeBSD before.
I'm about to install pfSense top of the TrueNAS and using VLAN's. Am I living in utopia? :D
NUC specs: https://ark.intel.com/content/www/us/en/ark/products/126148/intel-nuc-kit-nuc8i5beh.html