Yeah, sorry we don't have the exact HTML ready. But it's not difficult to search the code for relevant examples, as the drop-down is used in many places. E.g.:
github.com/getk2/k2/blob/e574284dfbef1cc01d967b08fb734fcf90e41faf/administrator/components/com_k2/views/categories/view.html.php#L143-L149
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$items = new K2ModelItemlist();
$allowed = $items->getCategoriesTree();
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