How to display daily data in a trendLevel function from the openair library?

Hi, I am wondering if it is possible that in the graph below instead of the weekdays the exact dates (1st June, 2nd June, etc) would be displayed, so that I would have 30/31 columns for each month.

I used the function trendLevel from openair library and it is not possible to change the x to days. Do you have any ideas how to solve it? Thanks!

My dataset looks like this: