Choose annotatable items, not all wrapped items

[vorpal56]

I have a container of elements, and I only want to be able to annotate only some of those elements in the container:

<div id="annotatable-container">
    <div id="content-0">
        <h5>don't want to annotate</h5>
        <span class="annotatable">want to annotate</span>
    </div>
    <div id="content-1">
        <h5>don't want to annotate</h5>
        <span class="annotatable">want to annotate</span>
    </div>
    ...
</div>

Initialization:

const el = document.getElementById('annotatable-container')
const r = new Recogito({content: el})

How would I go about only enabling annotation of elements with annotatable class?