Please note: this feature isn't activated by default. Please contact support if you'd like to activate this feature for your account.
As part of the Google audio news overview document, they state under "Best Practices":
Clear and separate intros
Each story must introduce the name of the publisher, either within the media file itself or as a separate <media:content> intro file in an mRSS feed, which is preferred.
(Optional) Outros
Outros are similar to intros, as specified previously. You can optionally include information about where a listener can find more of your content as a separate <media:content> file in the mRSS feed.
For example, you can include an MP3 that says, "To listen to our podcast, ask your Assistant to play 'The Example Times' podcast." These outros are played after medium-format stories. They aren't played after short stories that last less than two minutes.
This feature will allow you to provide Google with the preferred separate intro and/or outro. This will come up under <media:content> in the RSS feed that you submit to Google.
Setting it up
To activate this feature, please make a request through your support channel.
Once activated, you can find the setting under program settings - audio here:
Upload your intro and/or outro file. The intro audio needs to be less than 5 seconds and the outro should be less than 10 seconds in duration.
Finally, the playlist RSS needs ?type=GoogleNews added at the end for the intro/outro to appear in the actual RSS feed.
Once these steps are complete, you're ready to submit your feed to Google for approval!
Other notes
You can ensure that your audio loudness matches Google's requirements with Omny Studio's loudness normalization feature. Read more about that here.
Podcasts must have valid
<title>,<author>and<description>tags at the<channel>and<item>level of your podcast feed. You can use https://podba.se/validate/# to verify this.