nano /etc/telegraf/telegraf.d/input-hdhr.conf

[[inputs.exec]]
    commands = ["curl http://<IP-OF-DEVICE>/status.json"]
    timeout = "5s"
    data_format = "json"
    name_override = "HDHomeRun"
    tag_keys = ["Resource"]
  [inputs.exec.tags]
    device="<IP-OF-DEVICE>"

HERE is the json for the dashboard

This might get updated, might not.