I found hints such as this https://www.b4x.com/android/forum/threads/add-outline-to-text.110785/ but not cross-platform (AttributedString, from CSBuilder, doesn't exist in B4J)
Another alternative would be a cross-platform text effect library (ex : outline, shadows, gradients) but haven't found one.
Another alternative would be a cross-platform text effect library (ex : outline, shadows, gradients) but haven't found one.