Google has quietly updated the supported services page for Google Home, adding iHeartRadio as a supported music streaming service. Once it goes live, likely in the next few days, you will be able to request specific songs and artists to be played from the service. Adding it will be similar to other services like Pandora and Google Play Music. It will be under the Music section in the Google Home app where you will use your iHeartRadio account to sign in and link it to your Home.
The addition of this new service is another step in the continued growth of Google Home. Dozens of informational services have been added since the smart speaker-meets-Google Assistant was released back in November.