JSFiddle - React, Tailwind, and code Playground

HTML

<input type="text" placeholder="текст">

CSS

input::-webkit-input-placeholder:after{
   content: ' *';
   color: red;
}

input::-moz-input-placeholder:after{
   content: ' *';
   color: red;
}

input:-moz-input-placeholder:after{
   content: ' *';
   color: red;
}

input::-ms-input-placeholder:after{
   content: ' *';
   color: red;
}