How do I get DOp to render colorful emojis in the description?

You could use an Evaluator column that parses the emojis and displays them via markup.

if (operation != "markup") return desc;

d = desc;

d = RegExS(d, ":red_circle:", "<#FF0000>âš«</#>");
d = RegExS(d, ":green_circle:", "<#00FF00>âš«</#>");
d = RegExS(d, ":yellow_circle:", "<#FFFF00>âš«</#>");

return d;
XML
<?xml version="1.0"?>
<evalcolumn align="0" attrrefresh="no" autorefresh="no" blurrable="no" customgrouping="no" foldertype="all" keyword="descmu" maxstars="5" namerefresh="no" nocache="no" reversegroups="no" reversesort="no" supportmarkup="yes" title="descmu" type="0">if (operation != &quot;markup&quot;) return desc;

d = desc;

d = RegExS(d, &quot;:red_circle:&quot;, &quot;&lt;#FF0000&gt;âš«&lt;/#&gt;&quot;);
d = RegExS(d, &quot;:green_circle:&quot;, &quot;&lt;#00FF00&gt;âš«&lt;/#&gt;&quot;);
d = RegExS(d, &quot;:yellow_circle:&quot;, &quot;&lt;#FFFF00&gt;âš«&lt;/#&gt;&quot;);

return d;</evalcolumn>

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