In BS3, I could add a Glyphicon to an input-group with input-group-addon (jsfiddle):

<div class="row">
  <label class="col-xs-3 control-label" for="idPassphrase">Passphrase</label>
  <div class="col-xs-6">
    <div class="input-group">
      <input id="idPassphrase" class="form-control input-xs" type="password" autocomplete="off">
      <span class="input-group-addon">
        <span class="glyphicon glyphicon-eye-close"></span>
      </span>
    </div>
  </div>
</div>

This shows a password entry field, with an open/close eye icon to view or hide the password.

How do I do this in Bootstrap 5? There doesn’t seem to be an input-group-addon any more. The input-group docs don’t have any examples with graphics of any sort – the only option appears to be input-group-text.