Perspective XY Chart xAxes tooltip text {dateX}

[Transistor]

You're going to have to be creative then. Have a look at my question and self-answer in the link below. You might be able to adapt my approach.

XY Chart - adding batch labels

It seems that my best shot is, Create a batch-number dataset with (t_stamp, number) pairs. Number is in sequence 1, 2, 3, etc. Create another y-axis. I set the axis range to very large numbers so that the difference in vertical position of my batch numbers is not discernable. In my case I made it max : 1000 and min : -10000. This forces the zero line above the top of my other charts. Add another series and set it to line. Bind it to the batch-number dataset.