Attach debugger to basicui

I would like to attach my debugger to e.g. org.openhab.ui.basic.internal.render.ChartRenderer and see what’s going on. The Class is part of basicui and is a webui. How to setup everything for addons is described here Visual Studio Code | openHAB but the ui’s are in their own repository. Can someone share knowledge how I could accomplish this?

I got it working. It’s the same process for the ui as for the bindings. I’m surprised that I can set breakpoints in java files and they work although I can’t even find the basicui jar in the openhab directory.