Request review for auto connections for interfaces -Personal files, System files & Hardware observe for MqttDesk snap

The personal-files doc have some examples about it. Did you take a look? So you should have something like:

plugs:
  dot-local-share-data-bconf-data-conf:
    interface: personal-files
    write:
    - $HOME/.local/share/data/bconf/data.conf

Otherwise, share your snapcraft declaration and we can review it.