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There are two known widgets that can parse RSS feeds contents from external sources. All of them are outdated, which were last committed some 5 or 7 years ago.

The one by Towhid now can only parse texts, and the script is dysfunctional if you select the thumbnail option.

Another issue is that a widget cannot be added exclusively to homepage. The option "recent questions and answers" may apply to those question-list pages in categories too.

Thanks for reading.
closed with the note: Found a solution
by
Much simpler than I thought:


$getUrl = $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    $html = "";
$url = "https://yourwebsite.com/feed/";
$xml = simplexml_load_file($url);
if ($getUrl == "yourwebsite.com/")

{
for($i = 0; $i < 5; $i++){

    $image = $xml->channel->item[$i]->children('media', True)->content->attributes();
    $title = $xml->channel->item[$i]->title;
    $link = $xml->channel->item[$i]->link;
    $description = $xml->channel->item[$i]->description;
    $pubDate = $xml->channel->item[$i]->pubDate;

    $html .= "<img src='$image' alt='$title'>";
    $html .= "<a href='$link'><h3>$title</h3></a>";
    $html .= "$description";
    $html .= "<br />$pubDate<hr />";
}
echo $html;}
...