Can you explain the calculations and the chart in general for workload on the sprint report page. there is no proper legend, the calculations are done based on issue count, the option to swicth to story points doesn't work and I do not understand how the number of issues actually relate to a percentage. the total percentages do not add up to 100 and I just can't work it out. Is there some proper guidance available on how it is calculated and what good use cases for it are please. 