Is there a way to create material with labels from many available png images? use scripting in keyshot?
I don't think there is way to do what you are asking, which is to take a folder of images and auto-apply all of them onto a material. You could create a multi-material easily via duplication and swap the various labels and then use scripting to apply it to various objects (but you'd have to tweak the sizing), or use the Configurator to render out all the options, but the actual application of the labels would be need to be done manually. The scripting forum may know a way to do this that I am not aware of.
KeyShot 9.X Scripting Documentation
https://media.keyshot.com/scripting/doc/9.1/lux.html
Scripting Forum:
https://forum.keyshot.com/index.php?board=67.0
how to use Script to mapping PNG labels to Model .Bip File. many thanks
https://forum.keyshot.com/index.php?topic=26285.msg110796#msg110796