You can now try out the List Widget (by activating the experimental feature) using the pre-release available in the link below. The folder also contains draft documentation, and an example (screen below). In the example a Task List and Legend is created and positioned on a page, or in the side panel. Some actions of the Task List are interactive.
The pre-release, the release conditions, and current documentation can be found here until March 15. Of course, you need to have an actively maintained license to try it out.
Please add your feedback - do include screen dumps as we love to see what you can build - as a reply to this post. Happy building!
PS: An earlier discussion on this topic can be found here: https://community.aimms.com/product-updates-roadmap-customers-only-36/new-list-widget-526