Is it possible to format the time tooltip in a time series graph panel?

Hi,
I’m showing a graph with bar per month, and the tooltip show the beginning of the month (e.g. ‘12/01/2020’) and I would like it to show just month and year (e.g. ‘12/2020’).
I couldn’t find any way to control it… is there a way to do it via the json model or otherwise?

Thanks,
Bennny

Same question here. Can anyone please help?