Dit not find in this forum and might be helpfull for the diagram addicts.
Looker Studio from google is free for normal use and allows you to extract data from almost any data source combine and display in a Diagram. Google sheets is also a great help to let you embedd diagrams but does require a lot of additional columns which will get you to the sheet limit fast. Looker studio can combine data from for example different sheets into 1 diagram and modify ranges etc
My workflow is:
Homey > Google Sheets > Looker Sudio > Custom tile (URL) > Dashboard
