Chnage grid enddate with changing the end date column value after rendering

Can we change the end date of a grid after rendering without changing the column value.

For example - The End date column value is 2023-04-06 but the Gantt grid width will be extended to 2023-04-13.

I am getting this extended date value in another field from server.

Please find the attached image for better understanding.

Hello Chinmaya,
If a task property is changed, you need to repaint it to see the changes. There is no way to repaint only part of the row. Gantt will repaint the whole row.
If you want to show a different value in the grid column, you need to use the template function of the column configuration. It allows showing any text or HTML elements in the cell instead of the actual value:
https://docs.dhtmlx.com/gantt/desktop__specifying_columns.html#datamappingandtemplates

Here is an example:
https://snippet.dhtmlx.com/gncjaf0t