I'm making a new GEGL plugin soon that makes a background glow on the same layer.
You can test it without installing by putting this syntax in GIMP's GEGL graph
id=0 dst-over aux=[ ref=0
id=1
gaussian-blur std-dev-x=43 std-dev-y=43
bloom strength=400
opacity value=1.3
gimp:layer-mode layer-mode=linear-light aux=[ ref=1 gaussian-blur std-dev-x=50 std-dev-y=50 ]
hue-chroma lightness=20 chroma=16
brightness-contrast brightness=0.3
]
All I do is rewrite the same thing in a way that makes it a filter with sliders. I will get to it over the weekend or possibly tonight. I am making the filter due to a vested interest not because I care about the community, its just happen stance that the community can benefit from my passion