Add custom tinymce initial configuration option

Question

I want to add this customOption: "" as an option on tinymce.init

<script type="text/javascript">
tinymce.init({
    customOption: "",
    selector: "textarea",
    plugins: [
        "advlist", "anchor", "autolink", "charmap", "code", "fullscreen",
        "help", "image", "insertdatetime", "link", "lists", "media",
        "preview", "searchreplace", "table", "visualblocks",
    ]
});
</script>

tinymce version: 6.7.0