composure / export bloom pass only

Hi,
I made several compositions of flying logos or virtual sets. I already had managed to export meshes masks, depth and beauty passes using sequencer and composure export, but I can’t figure how to export the bloom postprocess pass without any mesh visible , but only the glow effect as a layer, like ‘post’ pass in Octane for example
I will apply it over beauty pass in AE using screen or additive blend.

I tried a lot of things in Transform Passes , adding a post process pass set.
by choosing Lens bloom pass, I get my beauty pass with meshes and bloom over.
by choosing “Lens bloom pass - bloom only” I only get a black image

I have searched in docs but “Lens bloom pass - bloom only” seems documented nowhere.
did I miss something ?

thanks for your enlightenment…