Deploy to the 'current' datacenter

I’m trying to find a way to avoid specifying nomad datacenter in each nomad file.

Interpolation is not working with that attribute:

job "job-name" {
  datacenters = ["${node.datacenter}"]

results in deploying to the datacenter named ${node.datacenter}.
Why that is not possible?

So far I have a little complicated working solution using levant:
datacenter=$(nomad node status -t “{{range .}}{{.Datacenter}}{{end}}”)
levant deploy -var “datacenter=$datacenter” job.nomad

job "job-name" {
  datacenters = ["[[.datacenter]]"]

But would like to know is there something less verbose.