ist es möglich, <div> oder <span> innerhalb eines <option> -Tags hinzuzufügen?

var x, i, j, selElmnt, a, b, c;
x = document.getElementsByClassName("custom-select");
for (i = 0; i < x.length; i++) {
  selElmnt = x[i].getElementsByTagName("select")[0];
  a = document.createElement("DIV");
  a.setAttribute("class", "select-selected");
  a.innerHTML = selElmnt.options[selElmnt.selectedIndex].innerHTML;
  a2 = document.createElement("SPAN");
  a2.setAttribute("class", "square-box");
  a2.setAttribute("style", "background-color: " + selElmnt.options[selElmnt.selectedIndex].getAttribute("COLOR"));
  a.appendChild(a2);
  x[i].appendChild(a);
  b = document.createElement("DIV");
  b.setAttribute("class", "select-items select-hide");
  for (j = 0; j < selElmnt.length; j++) {
    c = document.createElement("DIV");
    c.innerHTML = selElmnt.options[j].innerHTML;
    d = document.createElement("SPAN");
    d.setAttribute("class", "square-box");
    d.setAttribute("style", "background-color: " + selElmnt.options[j].getAttribute("COLOR"));
    c.appendChild(d);
    c.addEventListener("click", function(e) {
      var y, i, k, s, h;
      s = this.parentNode.parentNode.getElementsByTagName("select")[0];
      h = this.parentNode.previousSibling;
      for (i = 0; i < s.length; i++) {
        if (s.options[i].innerText == this.innerText) {
          s.selectedIndex = i;
          h.innerHTML = this.innerHTML;
          y = this.parentNode.getElementsByClassName("same-as-selected");
          for (k = 0; k < y.length; k++) {
            y[k].removeAttribute("class");
          }
          this.setAttribute("class", "same-as-selected");
          break;
        }
      }
      h.click();
    });
    b.appendChild(c);
  }
  x[i].appendChild(b);
  a.addEventListener("click", function(e) {
    e.stopPropagation();
    closeAllSelect(this);
    this.nextSibling.classList.toggle("select-hide");
    this.classList.toggle("select-arrow-active");
  });
}

function closeAllSelect(elmnt) {
  var x, y, i, arrNo = [];
  x = document.getElementsByClassName("select-items");
  y = document.getElementsByClassName("select-selected");
  for (i = 0; i < y.length; i++) {
    if (elmnt == y[i]) {
      arrNo.Push(i)
    } else {
      y[i].classList.remove("select-arrow-active");
    }
  }
  for (i = 0; i < x.length; i++) {
    if (arrNo.indexOf(i)) {
      x[i].classList.add("select-hide");
    }
  }
}
document.addEventListener("click", closeAllSelect);

.custom-select {
  position: relative;
  font-family: Arial;
}

.custom-select select {
  display: none;
}

.select-selected {
  background-color: DodgerBlue;
}

.select-selected:after {
  position: absolute;
  content: "";
  top: 14px;
  right: 10px;
  width: 0;
  height: 0;
  border: 6px solid transparent;
  border-color: #fff transparent transparent transparent;
}

.select-selected.select-arrow-active:after {
  border-color: transparent transparent #fff transparent;
  top: 7px;
}

.select-items div,
.select-selected {
  color: #ffffff;
  padding: 8px 16px;
  border: 1px solid transparent;
  border-color: transparent transparent rgba(0, 0, 0, 0.1) transparent;
  cursor: pointer;
  user-select: none;
}

.select-items {
  position: absolute;
  background-color: DodgerBlue;
  top: 100%;
  left: 0;
  right: 0;
  z-index: 99;
}

.select-hide {
  display: none;
}

.select-items div:hover,
.same-as-selected {
  background-color: rgba(0, 0, 0, 0.1);
}

.select-items .square-box {
  height: 18px;
  width: 18px;
  float: right;
}

.select-selected .square-box {
  height: 18px;
  width: 18px;
  right: 30px;
  position: absolute;
}

<div class="custom-select" style="width:200px;">
  <select>
    <option value="1" color="red">Audi</option>
    <option value="2" color="green" selected>BMW</option>
    <option value="3" color="yellow">Citroen</option>
    <option value="4">Ford</option>
    <option value="5">Honda</option>
    <option value="6">Jaguar</option>
    <option value="7">Land Rover</option>
    <option value="8">Mercedes</option>
    <option value="9">Mini</option>
    <option value="10">Nissan</option>
    <option value="11">Toyota</option>
    <option value="12">Volvo</option>
  </select>
</div>