nametag_update:
  type: task
  definitions: player
  script:
  - if <def[player].exists> {
    - foreach <server.list_online_players> {
      - team id:<def[value].name>true name:<def[player].name> prefix:something suffix:something
      - team id:<def[value].name>false name:<def[player].name> prefix:something suffix:something
      }
    } else {
    - foreach <server.list_online_players> {
      - define player %value%
      - foreach <server.list_online_players> {
        - team id:<def[value].name>true name:<def[player].name> prefix:something suffix:something
        - team id:<def[value].name>false name:<def[player].name> prefix:something suffix:something
        }
      }
    }