JSFiddle - React, Tailwind, and code Playground

HTML

<label>
 <input type="radio" name="rad">Radio 1 <small>Hinweis radio 1</small>
</label>
    
<label>
 <input type="radio" name="rad">Radio 2 <small>Hinweis radio 2</small>
</label>

SCSS

label {
    display:block;     
    small {
      display:none;
    }
    input[type="radio"]:checked + small { 
       display:inline-block; 
    }         
}