This plugin will display an image showing the number of comments on a post at the bottom of each feed item (RSS|Atom|etc) that links to the comments section of that post. 
You are able to choose which colors to use for the background of the image and the color of the text as well. 
The reason you would want to use an image instead of plain text is because RSS feeds are generally only updated if the build-date or modification-date components are changed, which does not happen if someone leaves a new comment. This will allow the comment number to update dynamically, regardless of when it’s been first viewed by a user.
You’re able to set the colors of the text and the background in the standard 6 character hex format. 
You may also supply formats for what will show if there are zero comments on your post or more. 
I just added the option to include the image link in the feed excerpts as well. (called by <code>the_excerpt_rss</code> function)
Two Font files are included with the plugin, Arial and SenateBold. You can set which of the two you would like to use, or optionally upload your own .ttf font file to use to render the text on the image.
This requires the GD Image library extension in PHP to function. To check whether or not your server has this use the <code><?php php_info(); ?></code> function and it should be listed.

Feed Comments Number

Add an image that displays the number of comments to your feed items.

vaakash

Super RSS Reader plugin allows you to display RSS feed(s) in an attractive way to your widget. It has options to display multiple RSS feeds separated by tabs in a single widget and has feature to add a news ticker like effect to it. See the features list below for complete list.
The widget is fully customizable with external styles and also has color themes out of the box. It is a perfect replacement for the default RSS widget in WordPress.
<a href="https://www.aakashweb.com/demos/super-rss-reader/" rel="nofollow ugc">Check out the LIVE DEMO of the plugin</a>
<h3>✨ Features</h3>
<ul>
<li>News ticker – Add news ticker like effect to the RSS feeds (can turn on of off)</li>
<li>Multiple tabs – Display multiple feeds in one widget separated by tabs.</li>
<li>Thumbnail – Display the thumbnail of the feed item.</li>
<li>Color themes – Options of multiple color themes out of the box. Customizable via CSS.</li>
<li>Different thumbnail positions (align left, right and cover)</li>
<li>Customizable ticker speed.</li>
<li>Different date formats for feed item (absolute and relative)</li>
<li>Supports RSS and atom feed.</li>
<li>Trim title and description text of the feed item.</li>
<li>Order feed items by date or random.</li>
</ul>
<h3>🌄 Display RSS feeds like</h3>
<ul>
<li>Your own website content like recent posts, comments, forum topics etc.</li>
<li>Articles, posts from related websites and share with your users.</li>
<li>Events, job listings etc. from other websites.</li>
<li>Deals, Craigslist, Google News RSS etc. You got it, any RSS feed on your site !</li>
</ul>
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/02aOG_-98Tg?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
<h3>💎 PRO version</h3>
Super RSS reader has a PRO version which has more features to further enhance and to get more control of the RSS feed you display. With the PRO version you can enjoy below additional features included and also support the development of this plugin.
<ul>
<li>Shortcode – Display RSS feed anywhere in your website using <code>[srr_feed]</code></li>
<li>Grid display – Display feed item in rows and columns</li>
<li>Paginated display – Display feed item in different pages with a pagination bar</li>
<li>Filter by keyword – Show/hide feed items based on keyword</li>
<li>Custom feed item template – Change order of feed item content, add HTML</li>
<li>Fetch thumbnail – Forcefully fetches the thumbnail from feed URL</li>
<li>Merge multiple feeds – Display multiple RSS feeds as one</li>
<li>4 new color themes</li>
</ul>
<a href="https://www.aakashweb.com/wordpress-plugins/super-rss-reader/?utm_source=readme&utm_medium=description&utm_campaign=srr-pro" rel="nofollow ugc">More information</a> – <a href="https://wpdemos.aakashweb.com/super-rss-reader/?utm_source=readme&utm_medium=description&utm_campaign=srr-pro" rel="nofollow ugc">Live demo</a>
<h3>Resources</h3>
<ul>
<li><a href="https://www.aakashweb.com/docs/super-rss-reader/faq/" rel="nofollow ugc">FAQs</a></li>
<li><a href="https://www.aakashweb.com/docs/super-rss-reader/" rel="nofollow ugc">Documentation</a></li>
<li><a href="https://www.aakashweb.com/forum/discuss/wordpress-plugins/super-rss-reader/" rel="nofollow ugc">Support forum</a></li>
</ul>

Super RSS Reader – Add attractive RSS Feed Widget

Display any RSS feed(s) in widget with news ticker effect in multiple tabs, thumbnails, customizable color themes and more.

Feed Comments Number vs Super RSS Reader – Add attractive RSS Feed Widget