How to manipulate node's opacity of label in view?

Development
1

Operating system: window 10
Slicer version: 5. 2.1

I want the opacity control to apply only to the label and not to the glyph.
image

I guess I need to adjust font style a in rgba, how to approach it?

# example 
temp.GetDisplayNode().SetPointLabelsVisibility(False)

instead Visibility => Opacity