Give dashboard elements a "Notes" field so Model Builders can leave development breadcrumbs

When working with a team of model builders sometimes changes to a dashboard aren't obvious, so it would be helpful to be able to leave a note behind for others to read.  I could see this being helpful for when a button is added to a dashboard, or a filter is adjusted or a section is moved to a different place, a name of something is changed etc.

A model builder could leaving comments that look something like this: 

• 20 FEB 2019: Added button X to the page because Project Managers needed direct access to the page"
• 18 FEB 2019: Changed the filter on module XYZ to be able to show ABC, also added conditional formatting to line item "Project Name"