How do I specify the values of the x-axis in a bar chart?

I am trying to display a frequency spectrum from a fourier transform in a bar chart. Since I am saving the values in influxdb, the bar chart shows the timestamps on the x-axis. However, I’d like to define my own values on the x-axis e.g. for each bar the specific frequency. Can anyone please help me with that? Here is my current configuration of the bar chart.


You can change it in this setting