Segue JS:

<script>
document.addEventListener("DOMContentLoaded", () => {
  // Lista de IDs corretos (sem tag ou seletor CSS)
  const ids = ["form-field-patente", "form-field-message", "", ""];

  ids.forEach(id => {
    const input = document.getElementById(id);
    if (input) {
      input.readOnly = true;
    }
  });
});
</script>