I’ve read @Stephan_B 's previous posts on this topic, about how the ratio of sampling point size to padding adjusts the maximum size of outline. However even with extreme values like point size to padding of 45:45, the outline is still not very thick at all at max values. The atlas render mode is SMOOTH_HINTED. Am I missing something?
What makes it possible to add visual FX on the text such as Dilation, Outline, Underlay (Shadow) is the use of Signed Distance Field. As such, you have to use one of the SDF render mode such as SDFAA, etc.