This is a demo tutorial. While there is no step-by-step commentary available (yet), the live demo below is fully functional. Feel free to open it for full source code.
This demo shows how we can use a custom function to defer chart instantiation and replace them with a thumbnail, which once clicked would be automatically replaced with a real chart.
See the Pen amCharts 4: Chart placeholders by amCharts team (@amcharts) on CodePen.24419