Creating Sankey with background picture and fixed nodes

Hello everyone!
I am looking for a way to combine a Sankey diagram polot with a background picture. The additional aim is to place the nodes (sources & sinks of the sankey) always on the same points on the background picture.

Is it possible to set the x- & y-coordinates of each node?

Does anyone have an idea or a workaround?

Thank you so much guys! :slight_smile: