How to custom labels of charts to be bold?

There is no way to make them bold. However, an unsupported approach would be to modify the symbol source code and wrap the labels in a bold tag.

Hi! Thanks for the reply. How can I do that?

This is an unsupported change, but if you open "C:\Program Files\PIPC\PIVision\Scripts\app\editor\symbols\sym-trend-template.html", there should be a line that reads <text ng-bind="legend.label"></text>

Wrap that line in a bold tag. It's only a subtle difference in the display. You can change the CSS properties of the label as well if needed.

This is an unsupported change, but if you open "C:\Program Files\PIPC\PIVision\Scripts\app\editor\symbols\sym-trend-template.html", there should be a line that reads <text ng-bind="legend.label"></text>

Wrap that line in a bold tag. It's only a subtle difference in the display. You can change the CSS properties of the label as well if needed.