Add the tags from VMs and add to the device as a custom property

Tried esx.tags=true? https://www.logicmonitor.com/support/monitoring/os-virtualization/esx-servers-vsphere/#tag . Doesn't use device-level properties though.

You can use PropertySources to run a powershell script to add the tags as device autoproperties. Your script will need to provide especially formatted output and that is covered in the documentation and you can look at existing PropertySources for examples.