Hass.io runs in Docker, Hass.io addons are just “special” docker containers that can be managed through Hass.io and sometimes have tighter integration with Home Assistant. Neither of those are necessary so you should be able to run pretty much any Docker container in HassOS. The easiest way is to use Frenck’s Portainer Add-on. I’m also running Hass.io (in Ubuntu 18.04.1 on a VM) and the Docker container I linked to works perfectly.
Community Hass.io Add-on: Google Assistant Webserver (broadcast messages without interrupting music)
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