How do i do normal maps or something similar?

So in my game my brother really wants the trees to interact with the light with normal maps, but im i have no idea how. I thought it might of been a sprite effect but not sure.

We have a lighting feature, but I don’t know what 'normal maps" mean.

There was a plan to include normal maps, but as far as I understand it, there has been no update/progress since 2020:

The person working on the feature deleted the repository last year. I think he’s stopped working on it. :disappointed_relieved: