Hi Neha,
Thanks for contacting Syncfusion support.
Based on your requirement we suspect that you have used excel filter in the grid component and want to bind external dataSource to the checkbox filter dialog to filter the values based on the external dataSource.
So, please confirm that you need the above behavior and also share the below details to validate further on your requirement.
1. Share the complete Grid rendering code example.
2. Share the API code example mentioned in your query
3. Share the type of filter used in the Grid.
4. Share the Syncfusion package version.
Regards,
Ajith G.