Thanks to SUSE who made this possible, now we have glow effect on objects in upcoming LibreOffice 7.0. Collabora Productivity engineers Tamás Bunth and myself together have implemented it for shapes and pictures.
Below are some screenshots of a PPTX slide with glow samples collected from the relevant bug report:
What puzzles me is why fontworks’ (right bottom) glow is not shown in the reference, although the effect is present in its properties. Somehow now LibreOffice seems to support glow in fontworks better 😉
Glow on pictures is only implemented in Impress and Draw. Glow on shapes is available in all modules.