Quick Chart display calculated values
Allow quick chart to use the source of a calculated value column from a list
Jonathan Cardy commented
https://www.365automate.com/charts will allow this plus counting the number of rows as @CG suggests below.
Quick Charts should also allow counting any value/string not just sum numbers. I have a simple risk list and want to show, in a bar chart, a count of risks that are H, M, L for example. Currently I have to set up an excel sheet, create a pivot table, add the excel web part, open and refresh once a month. Would be great to just set a quick chart that reads natively from my risk list.