Not this way, sorry. Two things have to be true: the firmware announces its settings sections when it connects, and Hermetry has the settings description (the manifest) for that model and firmware. Licensed devices have both.
For your own boards, declare cfg.* keys on the profile’s Configuration keys tab (type, limits, allowed values) and let the firmware read them as shared attributes. You get typed keys with limits, and the Attributes tab shows each one as In sync, Pending, Rejected or Drifted, without writing a manifest. Attributes has the device side.