Maybe I missed something big but... is there any support for import project local Kotlin Classes from other Files into a jupyter notebook? Found nothing online regarding this.

Works for me out of the box:

sry i meant from other files inside the same folder

Good question, I guess this more relates to #scripting because the question could be rephrased to how to import an existing source file via scripting API.

You can easily import jar file via

@file:DependsOn

,but I am not sure about kts. For ipynb probably not and it is better that way.