Hi,
Greetings from Syncfusion.
We have ensured your reported scenario with attached screenshot. Chart series legend is rendering fine with Chinese text in latest version 19.2.0.46. We have attached tested sample for your refence. Please specify in which scenario you are facing the reported issue.
If you are still facing problem, please try to replicate an issue in above sample or provide us issue reproduced sample or snippet, so that it will be helpful for further analysis and provide you the solution sooner.
Regards,
Durga G