Empty Date Column

Is it possible to add a non-date row on the ganttchart?
Because now, if a date is not entered, it takes a default date.
We want it to be possible to not have a date line and the user enters the history if needed.

Yes, it is possible to do that if the task is unscheduled. Unscheduled tasks are not displayed in the timeline, they are displayed only in the grid.
Here is an article about unscheduled tasks:
And here is an example: