In a previous question (Including Titles in HTML Requests), I learned how to customize an RSS/HTML request to search for news articles with the following keywords:
Within Google RSS, I can see the following information being displayed such as the "source URL":
<item>
<title>Hong Kong may consider tracking function on ‘Leave Home Safe’ app: health chief - South China Morning Post</title>
<link>https://news.google.com/rss/articles/CBMid2h0dHBzOi8vd3d3LnNjbXAuY29tL25ld3MvaG9uZy1rb25nL2hlYWx0aC1lbnZpcm9ubWVudC9hcnRpY2xlLzMxNjI2NDcvY29yb25hdmlydXMtaG9uZy1rb25nLW1heS1yZXNvcnQtaG9tZS1xdWFyYW50aW5l0gF3aHR0cHM6Ly9hbXAuc2NtcC5jb20vbmV3cy9ob25nLWtvbmcvaGVhbHRoLWVudmlyb25tZW50L2FydGljbGUvMzE2MjY0Ny9jb3JvbmF2aXJ1cy1ob25nLWtvbmctbWF5LXJlc29ydC1ob21lLXF1YXJhbnRpbmU?oc=5</link>
<guid isPermaLink="false">CBMid2h0dHBzOi8vd3d3LnNjbXAuY29tL25ld3MvaG9uZy1rb25nL2hlYWx0aC1lbnZpcm9ubWVudC9hcnRpY2xlLzMxNjI2NDcvY29yb25hdmlydXMtaG9uZy1rb25nLW1heS1yZXNvcnQtaG9tZS1xdWFyYW50aW5l0gF3aHR0cHM6Ly9hbXAuc2NtcC5jb20vbmV3cy9ob25nLWtvbmcvaGVhbHRoLWVudmlyb25tZW50L2FydGljbGUvMzE2MjY0Ny9jb3JvbmF2aXJ1cy1ob25nLWtvbmctbWF5LXJlc29ydC1ob21lLXF1YXJhbnRpbmU</guid>
<pubDate>Sat, 08 Jan 2022 08:00:00 GMT</pubDate>
<description><a href="https://news.google.com/rss/articles/CBMid2h0dHBzOi8vd3d3LnNjbXAuY29tL25ld3MvaG9uZy1rb25nL2hlYWx0aC1lbnZpcm9ubWVudC9hcnRpY2xlLzMxNjI2NDcvY29yb25hdmlydXMtaG9uZy1rb25nLW1heS1yZXNvcnQtaG9tZS1xdWFyYW50aW5l0gF3aHR0cHM6Ly9hbXAuc2NtcC5jb20vbmV3cy9ob25nLWtvbmcvaGVhbHRoLWVudmlyb25tZW50L2FydGljbGUvMzE2MjY0Ny9jb3JvbmF2aXJ1cy1ob25nLWtvbmctbWF5LXJlc29ydC1ob21lLXF1YXJhbnRpbmU?oc=5" target="_blank">Hong Kong may consider tracking function on ‘Leave Home Safe’ app: health chief</a> <font color="#6f6f6f">South China Morning Post</font></description>
<source url="https://www.scmp.com">South China Morning Post</source>
</item>
Is it possible to somehow add this information about the source URL into the query itself?
For example, suppose I am interested in viewing older versions of this page here: https://covid.cdc.gov/covid-data-tracker/#maps_new-admissions-rate-county. Could I then say that I only want to return source URLs from "https://covid.cdc.gov"?