When exporting a render with bloom in Eevee to PNG with transparency, the bloom gets lost. Here is a workaround. I split the rendered image in two nodes, blurred one and then mixed them together again. You can play with the blend modes if you want a slightly different effect and increase/decrease the blur with the x and y blur factors (amount is in pixels I believe)

Download the Blend 2.80 file here: CompositBlurBloom

Bloom with Eevee PNG
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