use simple BBCode in your comments 
atm follow tags available:
[b]bold[/b] 
[i]italic[/i] 
[u]underline[/u] 
[color=color]text[/color] example [color=FF6600]Text[/color]
list 
[ul] 
[li]number 1[/li] 
[li]number 2[/li] 
[li]number 3[/li] 
[/ul]
[url=http://www.google.com]Google[/url] 
[img=http://uri.to.pic][/img] (fix picsize)
(required wp-syntax) 
[code]your code[/code], 
optional with declaration of the language 
[code lang=”csharp”]your sample code[/code] (all available languages from wp-syntax possible)
<h3>Arbitrary section</h3>
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BBComments

Sergey Z.

Sergey Kuzmich

The plugin allows to create content spoilers with Guttenberg block or simple shortcode.
<pre><code>[spoiler title="Expand Me"]Spoiler content[/spoiler]
</code></pre>

Inline Spoilers

The plugin allows to create content spoilers with Guttenberg block or simple shortcode.

BBComments vs Inline Spoilers