Custom targets for widget Layout Updates in Magento 2
<p>I would like help working out how to add a custom container as a 'Layout Update' for a widget..</p>

<p>Currently, I only have the 3 basic options to choose from (Main Content Area, Siderbar Main and Sidebar Additional), but I would like to be able to add widgets to containers that I've created through various default.xml files.</p>

<p>How would I go about doing that?</p>

<p>Thanks,
Luke</p>