If I understand you correctly, you need to display an image inside the tooltip
of the cart. At the time of writing the required scenario is not supported by the chart. We have already logged a feature request to support custom content inside the tooltips and you can give your vote for it here
. You can also follow the item, this way you will be notified whenever we update it.
Pavel R. Pavlov
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Feedback Portal
and vote to affect the priority of the items