Hi, I guess you can create a helper NPE entity to hold the requester name and the number of pending request, then on the pie chart widget assign the data source to a microflow that retrieve the requester object for all of your users and count the requested object for each one, then do a create object (helper piechart entity) to assign both values. you can check here: https://forum.mendix.com/link/space/microflows/questions/102161
If you want to get rid of the % you can set a JSON like configuration on the textinfo tag: https://plotly.com/javascript/pie-charts/