Apologies, i mean MAC address of VLAN interfaces are taken from the physical port MAC address, so it would be ideal to match MAC Address of VLAN interface and physical port and to match them together as a port stack
e.g:
eth1 - 00:01:02:03:04:01
eth2 - 00:01:02:03:04:02
eth3 - 00:01:02:03:04:03
eth4 - 00:01:02:03:04:04
vlan100 - 00:01:02:03:04:02
vlan101 - 00:01:02:03:04:02{}
by checking mac address above, you would know vlan100 and vlan101 interfaces are sub interfaces of eth2, hence add them to a port-stack.
You can filter by ifType = l2vlan to ensure it is a vlan
This just a suggestion to be able to see the relation of a vlan and physical port correctly as how it is used on Huawei and others.