Legend function for 2026: bottom line for citation/reference purposes

[ChristianTrepte]

I would like to have an option in the legend tool, that allows the user to attach the references for the used layers at the bottom of the legend (like displayed in the picture ). Among a few other things it is one of the last elements I have to place manually. WouldLegend option for displaying references be really great to have this in the next update. Thanks!