Hi Luis,
Greetings from Syncfusion. We have analyzed your scenario and currently, we do not have support to fill the color of the chart series using SVG/PNG pattern. However, we have considered this as a feature request regarding to provide support to fill the color of the chart sereis using SVG/PNG pattern and have created feedback for it in our feedback portal. We will plan and include the request feature in any of our upcoming releases yet to come. You can also track the status of the feature using the below feedback link.
Regards,
Sriram Kiran