Could we have callback after rendering?

[YozhEzhi]

It would be great if we could to add custom elements at the end of generated items.
For example:

<div class="autocomplete-suggestions suggestions">
  <div class="autocomplete-suggestion" data-val="iphone 7">iphone 7</div>
  <div class="autocomplete-suggestion" data-val="iphone 6">iphone 6</div>
  <div class="autocomplete-suggestion" data-val="iphone 5s">iphone 5s</div>
  <div class="autocomplete-suggestion" data-val="iphone se">iphone se</div>
  <div class="autocomplete-suggestion" data-val="iphone">iphone</div>
  <div class="my-custom-permanent-element">Press Enter to search</div>
</div>

I want to use my-custom-permanent-element - as help text.
So I think we need ability to add custom non-interactive items or we need a callback, that will be fired after list items rendering.
Thanks!