That glass is part of the LCD assembly, they do sell the part ($50): https://www.elegoo.com/collections/parts...ome-2k-lcd
https://www.amazon.com/dp/B08LGGH62X/
There is a replacement video on the elegoo page.
Edit: I read your post more carefully, There shouldn't be any film above the glass. Maybe yours was assembled weird and the screen protector was under the black tape? On mine the black tape is applied directly to the glass. By adding the FEP film you probably increased the distance between the LCD and the part too much causing it to be poorly masked. Try just adding new black tape to seal the lcd glass to the printer.
https://www.amazon.com/dp/B08LGGH62X/
There is a replacement video on the elegoo page.
Edit: I read your post more carefully, There shouldn't be any film above the glass. Maybe yours was assembled weird and the screen protector was under the black tape? On mine the black tape is applied directly to the glass. By adding the FEP film you probably increased the distance between the LCD and the part too much causing it to be poorly masked. Try just adding new black tape to seal the lcd glass to the printer.