How to show x-axis fields in label chart diagonally?

Hi,

I have label chart, the x-axis fields are very long string values, which is causing the fields to be overlapping with each other. Instead of showing x axis fields in a straightline, i want to show it in diagonal or something which makes x axis fields to be clearly visible. Actual and Expected images are shown below. Can anyone help me on this?

Actual

Expected: