Currently the size of a bubble in a bubble chart can only be based on the value of an existing (number) field. I would like to display a chart with the size of bubbles being the number of initiatives and x/y axes being other attributes of that initiative
Thank you for reaching out to support about this as well. It looks like there is not currently a way to create the chart you want, even by our reporting experts. In the meantime, a pivot table is likely the best view of the data that you want to analyze. We will consider adding this bubble chart capability in the future.