[data-element-id] [data-headless-selector*="★"] {
  box-shadow: 0 0 0 1.5px orange !important;
}

[data-headless-selector*="★"]::before {
  content: "埋め込み・置換は解除中です　★を外すと適用されます" !important;
  background-color: orange !important;
}