Add Charts to Google Sites
The Answer is Always a Spreadsheet
What happens when you click on Charts? It offers you a filter of your spreadsheets. What? YES! Step 1 is to use Google Sheets to create the chart you want. Step 2 is to go to your Google Site and using the Insert tab choose “Charts” all the way at the bottom of things to insert. Select the spreadsheet that has one in it.
Pick the Chart