Scheduler Timeline View

We have a requirement in Scheduler timeline view were we need to use corner on left side of scheduler header and above section part.

I have attached a image. This part doesnot have any div or container to get handle on. Also several actions (resize,next, previous) redraws timeline which will remove dynamically attached html to the corner. Is there any way scheduler provides to handle this case

Currently there is no built-in way to do so, scheduler API provides no method for controlling content of that area.
If needed, such element can be injected via JS. Please see the example