Hi Franky Lee,
Thank you for contacting Syncfusion support.
We have checked your reported requirement and currently we don’t have v-model support for RadioButon. However, we have planned to include this fix in our Essential Studio Volume 4 release. You can track the status of this defect using below link from our feedback portal,
Could you please check the above details and get back to us, if you need any further assistance on this.
Regards,
Sangeetha M