2 Added sketch and fixed a typo
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If the 2 door panel in the middle overlay each other completely, you can pilot holes through the first panel for the screw to slip through and a smaller pilot hole in the outside panel for the screw to tap into. Only drill where the metal is hollow. The glass only goes into the metal no more than 3/4" so there should be plenty to drill into so the drill hitsdoes not hit the glass.

Door screw

If the 2 door panel in the middle overlay each other completely, you can pilot holes through the first panel for the screw to slip through and a smaller pilot hole in the outside panel for the screw to tap into. Only drill where the metal is hollow. The glass only goes into the metal no more than 3/4" so there should be plenty to drill into so the drill hits the glass.

If the 2 door panel in the middle overlay each other completely, you can pilot holes through the first panel for the screw to slip through and a smaller pilot hole in the outside panel for the screw to tap into. Only drill where the metal is hollow. The glass only goes into the metal no more than 3/4" so there should be plenty to drill into so the drill does not hit the glass.

Door screw

1
source | link

If the 2 door panel in the middle overlay each other completely, you can pilot holes through the first panel for the screw to slip through and a smaller pilot hole in the outside panel for the screw to tap into. Only drill where the metal is hollow. The glass only goes into the metal no more than 3/4" so there should be plenty to drill into so the drill hits the glass.