Hey,
it would be nice to be able to print unique serial numbers in the Silkscreen of ordered boards. With JLC for example, you put a placeholder string such as “SERSERSER” on the board, which then gets replaced by a unique number during production. This would greatly help being able to differentiate the boards later, especially since the silkscreen is far more durable than just stickers on the boards, which is the alternative i currently see.
greetings,
Erik