Open WordPress RSS feed block links in new tab

newTab.js

/** Add target="_blank" to RSS block links */
let rssTitles = document.getElementsByClassName('wp-block-rss__item-title');
let len = rssTitles.length;
for(let i=0; i<len; i++)
{
  let link = rssTitles[i].getElementsByTagName('a')[0];
  link.target = "_blank";
}