It would be useful if class breaks from a layer's drawing style could be accessed in Map Viewer charts. For example, classifying a layer by an attribute in the renderer using natural breaks, and then summarizing the acres per class in a chart. If the symbology could be carried over as well, even better.
I remember seeing a blog post about setting up something similar with the Javascript API or Arcade in pop-ups, but please consider adding this to the roadmap for the default Charts!