Tooltip, flyout or popup for elements to add details and/or action items

[HQRaja]

It would be great to have the ability to create tooltips, flyouts or popups for elements, to which we could add more details without making them part of the view; they could be made to show up by hovering over or clicking a small icon attached to the element to which they have been added. This would greatly aid in building a flowchart with a lot of detail associated with each element.

Example use case: I've built a flowchart for a user flow of my upcoming startup and I can only fit step titles in the elements, but I'd like to also attach lists of action items needed to implement each step, to the relevant steps, and something like what I've described above would be immensely useful.

My apologies in case something like this (or a suitable alternative) exists, in which case please be kind enough to point me to it. Thank you!