You may use HTML here, but ideally markup should be made in templates rather than phrases.<br>
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You may use <code>&#123;icon::name&#125;</code> to display an icon in the default variant, or <code>&#123;icon:variant::name&#125;</code> to display an icon in a specific variant. For example, <code>&#123;icon::alien&#125;</code> or <code>&#123;icon:fas::alien&#125;</code>.