Load Config action doesn't support TF prefix param

[smgee]

In loading a TF display or Robot Model display, I've noticed there is no entry under the 'options' struct to specify the TF Prefix. While it can be done manually, I would have expected this parameter to be exposed while loading a config file. I've tried explicitly adding it during the load action hoping it was a hidden feature, but that doesn't seem to be the case.

Does the option exist and I can't figure out the correct parameter name? Is there a reason not to include this option when loading? I would imagine the text below to be something that is possible -

  "displays": [
    {
      "isShown": true,
      "name": "Robot model",
      "options": {
        "param": "robot_description",
        "tfPrefix": "robot_prefix"
      },
      "type": "urdf"
    }