Hello!
You’ve had a feature request open for 16 days because you knew this wasn’t possible in the implemented 3D engine features. 3d lights into gdevelop
As of today, that is still true. There is not any 3D lighting in the native 3D engine. You’ll have to wait to see if they implement your feature request before it’d be possible.
Keep an eye out on the feature request threads to see if it progresses, but please note that not all feature requests are utilized or adopted, so this may not ever come to past.