Add transparency (alpha channel) to ScopeLineAnimator line and / or markers

I have adapted the sfunxy sfunction for 2D plots in Simulink for my purposes and now I want to ajust the transparency of the line markers.

On UndocumentedMatlab.com I found a tutorial on how to modify marker transparency in standard plots . However, this approach does not work with the line objects of the ScopeLineAnimator class used in sfunxy.

ud.XYAxes        = axes;

new_line         = feval(@()matlab.graphics.animation.ScopeLineAnimator('maxNumVertices',50000));
new_line.Parent  = ud.XYAxes;
ud.XYLine        = new_line;

set(ud.XYLine, 'LineStyle','none','Color','r','Marker','.','MarkerSize',10);

set(ud.XYLine, 'MarkerFaceClor',uint8(255*[1;0;0;0.2]) % This does not work

So my question is: Is there a way to make lines and / or markers of the ScopeLineAnimator class transparent?