vlans assigned to services and apps

unfortunately my TrueNAS has only one NIC.
I would like to use the IP address on the manage untag network for management, and assign different VLAN TAGs to the APPs and services.
Example:

  • There are no problems for accessing from manage untag
  • PLEX vlan tagged HOME
  • SMB vlan dedicated for share or service

I hope I have expressed the case.

VLAN creation is simple. I can’t find how to assign them to the APPs and services

Perhaps it can be made under Network → Interfaces → Add → VLAN. Never did it myself, though.