@tailor See here, section “Reuse built-in widgets”:
In all theory you can spawn a chart with <widget-chart ng-model="..."></widget-chart> and extracting the model from an existing chart with the “Edit the local panel configuration” technique as described, however the charts are one of those widgets types like the knob which adjust their size automatically, so it’s more difficult to have it positioned correctly, you may have to tinker a bit.