Hi Markus,
We would like to inform you that we have checked the possibilities to get the chart without adding to the visual tree. Unfortunately, we were unable to get the chart stream for non-visual items.
Already, we have created this as a feature request and added it to our feature request list. You can track the status of this feature in the below feedback portal link.
Feedback:
https://www.syncfusion.com/feedback/51903/export-support-for-charts-without-adding-to-the-visual-tree
We will prioritize the features in every release based on the demands, and we do not have an immediate plan to implement this since we committed to already planned work. So, this feature will be available for any of our upcoming releases.
Please cast your vote to make it count, and if you have any more specifications or suggestions for the feature request, you can add them as a comment in the feedback portal.
Regards,
Nitheeshkumar.