Hi Derek,
Thank you for contacting Syncfusion support.
Currently, Excel to PDF conversion is not supported in ASP.NET Core due to GDI limitation. So, ChartToImageConverter API hasn’t been exposed. We will implement this feature in any of our upcoming releases. We usually have an interval of at least three months between releases. The feature implementation would also greatly depend on the factors such as product design, code compatibility and complexity. We will update you when this feature has been implemented.
Regards,
Dilli babu.