Hi Salokya,
The Kanban uses DataManager, which supports both RESTful data service binding and JavaScript object array binding. The dataSource property of Kanban can be assigned either with the instance of DataManager or JavaScript object array collection, as it supports both local and remote data binding.
Please refer to the below documentation for further reference.
Documentation: https://ej2.syncfusion.com/react/documentation/kanban/data-binding/#data-binding
Regards,
Vinothkumar