You can't, unless you happen to own a laser cutter.
Tried scoring with knife. Crack.
Diamond tipped engraving tool. Sort of works, but don't apply pressure as you come off the glass.
A flat diamond coated sharpening stone did remove material, but very slow
A flat diamond (tile) file was simply too coarse and caused cracking.
Do check it's glass. In true marketing style, there are plenty of 'tempered' protectors that are plastic and cut easily with a craft knife.
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