2

I turned on 'render single layer' in the view layer proprieties and it worked:


1

as Jachym commented here is an example: here with part glare: (as you wanted, solution via mix node and mask image) without glare: (i just muted the glare node) with full glare: (glare connected to viewer instead mix node to viewer)


1

you can just drag and drop the image in the compositor and then use your nodes setup and render it with F12:


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