Hassio / hass.io add on config files?

Hello,

I know folks are runnig Hass.io on this forum, either on the same Pi or a different one.

I'm struggling to setup the configuration.yaml entry for hass.io based on these instructions: Pi-hole - Home Assistant

Does anyone have a example you could post that is working for you? Any additional tips for configuring the UI on hassio is welcomed, too. Cheers!