Levant doesn't recognize "ui" as a valid key

[SCORP111]

Description

Levant doesn't recognize "ui" as a valid key

[ERROR] levant/command: error parsing 'job': 1 error occurred:
* job: invalid key: ui

Relevant Nomad job specification file

job "docs" {
  ui {
    description = "A job that uses **Nomad Variables**"
    link {
      label = "Learn more about Nomad"
      url   = "https://developer.hashicorp.com/nomad"
    }
    link {
      label = "Nomad on GitHub"
      url   = "https://github.com/hashicorp/nomad"
    }
  }
  # ...
}

Output of levant version:

levant -v
Levant v0.3.3

Debug log outputs from Levant:
[ERROR] levant/command: error parsing 'job': 1 error occurred:
* job: invalid key: ui