how do I create an interactive/animated chart?

Powerpoint is ok, but if you want to do it in InDesign, it's not difficult. You might check out my course on animations on LinkedIn Learning (Lynda.com): InDesign: Creating Animations | LinkedIn Learning, formerly Lynda.com

Also, you can publish to the web easily right from InDesign using Publish Online. Here are some examples of work done using InDesign (only) and Publish Online: http://bit.ly/PubOnCollection

Hope that helps.

You can definitely add interactivity and animation within InDesign.

This is a rather large topic. You might want to have a look at this page to get started…

Animate InDesign objects in your documents

You should also give some thought to how you might publish and view this material. A few starting points…

• Traditionally such content would be exported out as an interactive PDF. However, the ability to display the different forms of interactive content by various PDF viewers is getting worse, not better, and that includes Adobe Acrobat and the free Reader.
• ePub is an option but you will need to look at software options for displaying them. There are good free options.
• Publish Online is a service offered for free by Adobe and built into InDesign. It's HTML based and does a great job of displaying interactivity/animation in a browser on all devices. The biggest criticism I see for this is that the content is hosted on Adobe servers and can't be moved elsewhere.