Hello Paulo,
This applies to everything related to Jaspersoft Reports, as it is a third party product that we include with ITSM, and that is the Jasper site has a lot of useful information.
I think your solution may be here:
Advanced Chart Formatting | Jaspersoft Community
"Starting with Jaspersoft Version 6.2, the Advanced Properties Tab is designed to let you enter formatting commands:"
With this variable:
"yAxis.lables.style.fontSize
CSS styles for the label. Use whiteSpace: 'nowrap' to prevent wrapping of category labels. Use textOverflow: 'none' to prevent ellipsis (dots). Defaults to {"color":"#6D869F","fontWeight":"bold"}. For example, value set to:
"12px" "
Thanks, Kyle_R.