Hi Chaffois,
Thanks for contacting Syncfusion support.
By using the ColumnTemplate feature or valueAccessor API, you can show the customized value in the Grid column. But this is used only for the display purpose. All the Grid actions like Filtering, Searching, Grouping, Sorting, etc., are performed with the Grid’s dataSource value based on its column field name and its type not with the customized value. Also, Grid column does not support multiple field names. This is the intended behavior of EJ2 Grid.
So, it is not feasible to achieve your requirement in EJ2 Grid.
Regards,
Rajapandiyan S