HDR light studio and corona sky

I want to light an object using HDR Light Studio, but have it on a pure white background. Normally I use Octane and this is easy to set up, but Octane is extremely crash prone on my mac and I’m up against a deadline.

In Octane I set up an Octane environment that’s visible to camera only and doesn’t contribute to lighting or reflections etc. Then I use HDR Light Studio to do the lighting.

I’m trying a similar approach in Corona but the HDR Light Studio Environment obscures the white environment.

Is this possible?

Ah - got it working by adding a corona compositing tag to the HDR Light Studio environment