Embedding a separate panel on the left side of the modeler

Hi there,

I would like my client extension to add a panel on the left of the modeler. Basically similar to the properties panel on the right. I tried to follow the “slot” approach, but sadly I was only able to find some for tabs, status bar or bottom panel. Is there any other integration point I could use?

Right now, the only option I could think of would be to use document.getElementByXXX in combination with ReactDOM.createPortal, but this would be very hacky and implementation dependend.

Kind regards