okay, this seems logical.
But it is not the solution for my problem. I still get the same output: "project/filename.jpg" instead of "assets/img/project/filename.jpg". It does not matter which ID from the config mediasources i choose. Even the standard ID/filesystem gives the same output.
How can i get the relative path in front of the filename.jpg so i don't need to put it manually in the chunk-tpl.