Customize Grafana UI with a plugin

I would like to develop a Grafana 4.4.1 plugin to customize UI and add a new field to dashboard (i.e.: Author).
I’m looking for any documentation, or at least some examples, which could help me to develop this kind of plugin.

Thanks a lot in advance,
Best Regards,

There is no plugin type for dashboard fields.

There are only panel, data source & app plugins (apps = collection of panel, data source and dashboards).

Thanks torkel for the information