How do you alt-tag a shape object in Edge Animate and Muse?

Hello - I am trying to build accessible assets.

In Edge Animate I am able to alt tag images. But I cannot figure out how to alt tag a shape object. Sure I could just import shapes as images I suppose, but I like the shape objects in Edge because it's easy to animate transformations and color changes etc.

And for Muse, I have some images that are represented as a "fill" within rectangle shapes. This allows for interesting shapes and scrolling...but I'm not sure how to alt-tag those images!

Can anyone help with one or both issues?

Thanks!