Illumos - configure Unbound to start automatically

I am running Illumos on a production system that is getting the DNS-settings from DHCP, and I would like to use Unbound as a local resolver to resolve hosts over DNS-over-TLS.

However, I am not sure about how to automatically start Unbound at boot, or even configure the host to use the Unbound DNS-resolver (except modifying resolv.conf). I am not able to reconfigure the DHCP-server to my needs.

How do I do the following:

1. Configure Unbound to start automatically
2. Configure the system to permanetly use the local Unbound resolver as resolver

Thanks!